You need to post the URL to the photo. It will look something like this:
http://i24.photobucket.com/albums/c43/BrianInOregon/Guns/SeansWin9422Trapper3.jpg
If you open up the pic in Photobucket, to the right will be some codes. The Direct code is the one you want to copy. When pasted into the ts.com Image URL the image will appear in your post, above your text, as I have done here.
You can also use HTML code to insert the image in other places in your post, but that assumes you know HTML code.
Edit: Bill, sorry, I misread your post. I thought you wanted to know how to link to a Photobucket image. I'll leave the above up for those who need this info.