You don't want to upload anything to this site for a post. You want to link
your photos to this site. (uploading to your "Album" is ok, but don't use those photos in a post)
I keep a folder on my photobucket account called "forum pictures". Upload the picture/s you want to include in a post. When you click on the uploaded picture and it's displayed in Photobucket....it will have links to one side that you can use share in a post. On this forum you'll want what's called the "Direct Link" (see pic below) When you click on it ....it will automatically copy it so all you have to do is paste it into you post after clicking on the "Insert image" button.
Hope this helps.