I'll say my method of it, and my understanding of the situation.
If you already have pictures uploaded to a hosting site:
Either find the url for the direct link to the picture, or start clicking on the picture to bring it's largest size, until the url is the most direct link. Copy and paste that into tags.
If you're talking about uploading directly to bladeforums, upload it as usual, then preview your post, and click on the attached pictures to bring them up in a new tab/window. Copy the link to them and put them in [IMG] tags. It's a lot of work sometimes, but it gets the job done.