Well a lot has changed since 2007. Windows XP? what's that?
Here is a step by step, assuming you know a bit about computers, other wise get a 12 yr old to do it for you.
Go to photobucket.com and set up an account
Plug your camera into computer, go to your PB account, click green upload button
Select where pics are coming from (camera)
Go to CGN on another TAB in your browser
Start an ad in EE (write your ad details)
Click the TAB you have open for PB
Click the IMG file box (it should auto copy the file)
Click the TAB for CGN and you are at your EE Ad
Right click your mouse button, then select and click Paste. Save your ad.
You are done.
Don't worry that you can't see the picture. Now go to the forum and open your ad and you will see picture