Open photobucket and go to the album where your image is stored... hover the curser over the image and copy the HTML code
Here is the linked in photo...
In the example above I copied the HTML code
from photobucket, but you can also use the Direct link
In the posted photo above, if you hover the curser over the image, you can see the alt="darkandstormy.jpg (c) shimokita"
. As well as the black border="2"
Hope this helps.
Edit: BTW... you don't actually "upload" the photos from photobucket to the forum, but add a link to your photos.