On the RHS of the screen here, there is a photo gallery. Click on the link, then login(don't know why you have to log in again but just do it anyway) then the page will have a link that says "upload photos" click on that and browse your computer for the picture you want to upload. Keep in mind it has to be 200k or less, enter in all the pertinent info about your picture and click "submit" or whatever it says at the bottom of the page.
Then it will show you your picture in the photo gallery. In order to show it in one of the board forums you can either post it as a link using the URL tags or you can right click the picture, go to properties and copy the link and then post the actual picture using the IMG tags.
Clear as mud?

Let me know if you need more help.
Christy
