Thanks everyone, I'll get to work!
The wiki is down with a “bug”. For several days it's been readable, but not “editable”. Maybe that was your problem? Also, you have to register separately to edit the wiki. You can register using your WWP login name and password (if you want to), but it's a separate registration. Your existing WWP account does not provide access to the wiki.
Here's how you add items. Rather than explain the process generically, it will be easier if I walk through the specific steps to add something to “Operation Press Pack”. You'll be able to adapt this to whatever you want to do in other sections. Run through it once and you'll have it. It's really easy once you do it.
For this example, let's assume you want to add a text document “Notes on Chart” to the wiki. Whatever we add to the wiki, first we create a “container” for it. Then we add the document, chart, links, etc.
1.Login to the wiki
2.On the opening “Main Page” click on “On-line Operations” in the center panel “Anonymous”
3.On the page “On-line operations” click on “Operation press pack”
4.On the page “Operation press pack” scroll down to “Corporate Scientology, Cashflow, and Tax Exempt Status”
5.Click the blue word  on the right side of the screen. It's on the same line as the section title.
6.You're now in the edit frame for this section. The lines with double brackets are active frames or “containers”. We need to make one.
7.“Click” into the frame. You can “click” in anywhere, but let's put the cursor at the end of the line, * [[Organization Chart]]
8.Hit “return” to create a blank line underneath * [[Organization Chart]] Obviously, you can create a blank line anywhere, depending on where you want the new container to appear. Let's put it under * [[Organization Chart]] for now.
9.Type * [[Notes on Chart]] on the blank line you've created. (you need to include the asterisk).
10.Click “Save page” or “Show preview” at the bottom of the screen. This will take you up one level to the “Corporate Scientology, Cashflow, and Tax Exempt Status” section.
11.You will now see “Notes on Chart” in red letters underneath “Organization Chart” This is the container you created to add the notes.
12.Click on the red letters “Notes on Chart” The red indicates the "container" is empty.
13.This opens the “container” and shows a blank frame where you can copy/paste your text. You should see “Editing Notes on Chart” over-top of the frame along with some buttons for text formatting.
14.You can copy/paste text into the frame, or type text directly. You can also add links.
15.Click “Save page” or “Show preview” to see how your text looks. Once you click “Save Page” whatever you've added is saved to the wiki. You can go back in and edit it at any time.
That's all there is to adding content to the wiki, but here are a few notes.
Uploading Images: To add image files you'll need to upload the image and link it to your “container”. On the left side of the screen you'll see a box labeled “toolbox”. Click on “upload file” to add an image to the wiki that you can link to your container. You can also click “Special Pages” and then click “Upload file” under the “Media reports and uploads” section.
After uploading an image, navigate back to your “container” (or upload it first and then create the container)
In the "container" add the line [[file:nameofimage.jpg]]
This will display the image in your "container" after you click “Save page” or “Show preview”
The best way to see how to add images and formatting commands is to open an existing wiki item in “edit” mode and see what others have done. For example, If you open “Organization Chart” and click the “edit” tab, you'll see your chart identified as [[File: cosorgchartdoncarlo.jpg]] That's how I got your chart to display in that “container”
With large image files like your charts, it's difficult to add text to the "container" holding the chart, that is additional text, not the text in the chart. Once you size the added text proportional to the chart, you get a document so large it doesn't display well. I'd suggest using separate containers for textual notes, as described here.
Additionally, don't worry too much about formatting what you put in the wiki (unless you want to). Our helpful staff at “Operation press pack” will do the formatting for you and make whatever you submit “as pretty as a picture”!
Just get the content into the frame and we'll take it from there (if you like)
Final notes: there are other ways to do things, but these steps are generally applicable to any part of the wiki. For example, you can create and/or get to the “container” by clicking the “edit” tab at the top of the pertinent page instead of scrolling down to the blue 
Practicing: If you want to practice, try any operation described and click the “show preview” instead of “save page” at the bottom of any screen. That way you don't finalize anything. Just back out of whatever you've been playing with and it will disappear.
Practicing now, while the wiki has a bug, might be a good idea. The "show preview" functions work just fine, but "save page" is inoperative
Once you “save page” the content is committed to that section of the wiki. You can display it in any other section by simply typing [[title of my content]]. However, moving the content itself requires a note to the moderator.
It's not a big deal, but for me, it's easiest to add content to “operation press pack” and use that as “home base” for my content. Of course, you can choose any section of the wiki for your “home base” or scatter content throughout the wiki. It's up to you.
Hope this helps