Hmmm. So I think you are saying you want to upload photos stored on your ipad into your photobucket album? Not sure I will be any help but just in case, this is what I do to upload a pic from the iPad onto photo bucket. Sorry if you know all this already
Open photo bucket app and click on the tab that says upload media. Click on choose existing. This should automatically open the photos that are stored on your iPad. Click on any that you want to upload to photo bucket and then click upload. (Top of screen, in the middle)
When it says it has uploaded click on albums. At this point your photo bucket album will open and this is when I always have to click the refresh button (sort of circular arrow) to make the newly uploaded photos appear. Once the photos are there you just tap on the photo you want and then hit the little i to bring up the codes for copying.
Really hope someone who knows more than me can come along to help you properly!