@Jpasch25,
While you can't use the forum's software to upload a picture to your post, you can use one of the popular online image posting websites. I use
www.photobucket.com.
Register there, it's easy.
Then while you are on the website, click "Upload".
When the pic is loaded, (just a moment), click "library". That is the spot on Photobucket where all your pics will be held.
When you go to "library", you will see your pic. Click on that pic twice. Now you will come to a screen where the pic is large, and there will be several web addresses on the right side.
Click on the one that says "IMG", (for image). There will be a yellow line saying "copied". That means the IMG, (image) address of your pic is now on your computer's clipboard.
Then come here, start a post, press Ctrl-V (or Paste), and the pic should appear on your A2K post.
Good luck.