By IMAGELINK do you mean the name of the pic in the file?
No
When you want to use an image in a post of yours, you have to upload it to a website such as
tinypic.com.
Once you've uploaded it there, you'll be given a link that should show up like so:
http://i55.tinypic.com/28hjad.jpgIf you add image tags to the link like MegaScience showed, it should show up like so

(Just an example.)
So, all together, your post should contain
[img]http://i55.tinypic.com/28hjad.jpg[/img]Then you can press "Preview" at the bottom of the new-post page to see whether you did it right or not before you actually post.