Start off by finding a picture you like on the internet. Could be from google images, or anywere.
Right Click the image and say "Save Image As" (Firefox) or "Save Picture As" (Internet Explorer). Save it to your hard drive somewhere.
Now go to http://www.photobucket.com. If not a member click "join", then login to your account when you have joined up.
Click on "Choose Files" to tell Photobucket you want to upload a picture.
Find the image on your hard drive, then click "open".
The picture will upload, and you can add a Title and Description. Then click "Save and Continue".
At the bottom of the screen is a field called "IMG Code". This is the code you want to put in a message in our forum. Highlight the code and press "CTRL-C" to copy it to the clipboard.
Now go to our forums, and in a new message or a reply to an existing message, just press "CTRL-V" to paste that code from Photobucket in.
Here is a bigger version of the code in a message on our forum, so you can see the format.
Submit your message, and there is your picture.
Hope this helps.
Eagle