............my problem was, is, and always will be with photobucket app. never have been able to make it work right.
Fortunately, the only trouble I had was my username had already been used and I had to pick a different one.
In a nutshell:
I opened an account.
Loaded a couple images from my computer (Win XP - Firefox browser)
Hovered cursor over one of the images now in my album on Photobucket's server and window appeared.
Placed cursor on the words "Img Code: at bottom of window
Left clicked - Text in image code box switched to "Copied" briefly.
At this point, you are finished with the Photobucket screen
Opened a New Thread/Reply text box on S&W Forum.
Put the cursor in the text box
Right Click
Select "Paste"
The URL to the image on Photobucket's server is copied into the text box.
Add text and or other photos & post.
At what point does the sequence fail for you?
I've only done it a couple times, but it seemed pretty straight forward. Maybe they've made it less complicated since the last time you tried.
FWIW: Here is what I did while going through and verifying the steps listed above.