Fro imageshack, it works like this:
Go to imageshack.com, upload pictures.
When pictures are uploaded, highlight picture, then click on the top icon beside the picture (looks like a circle with an "I" in it)
That will open a second window. Make sure the "Include details" button is not checked, (unless you want them posted with the picture) then highlight the "Forum" info. Copy it, then paste it into the posting window here.
Hope that makes sense!
It should look something like this: [IMG]http:blahblahblah[/IMG]