Apologies if there is already a thread on this, I couldnt see one
To post pics on a forum post you will need to open a free photobucket account. Photobucket is a site where you can upload, store, share and edit your pics for free :)
Image hosting, free photo sharing & video sharing at Photobucket
When you upload a pic it will look like this.
You will see a box on the left hand side listing several codes, double click the bottom code it should automaticaly copy it for you, if it doesnt simply right click your mouse and select COPY.
Go to the post you are about to submit, choose where you want your pic to be. Right click you mouse and select PASTE
Your photobucket image code should appear like this:
[IMG]http://i291.photobucket.com/albums/ll311/bluevariety/bob%20clark/018-1.jpg[/IM]
The image wont appear until you submit or preview your post. On the link above i have removed a letter on purpose to only show the code not the image.
When you post a code and submit a post you'll see the image in its place like this: