ONce they are in Photobucket (and so should be sized around the 650 x 400 mark) then open your thread in the Gallery, go to photobucket, click on the web address of your photo, right click copy, come back to your forum thread, click on the photo icon (bottom row, 2nd from the left above the smilies), then right click paste in between the 2 brackets.
Keep going until you have given us the guided tour!
It's what I am currently doing so you can see bits of my Japan trip. But I have almost 1000 photos to go through and figure out which ones are OK to upload.