Is this your Photo Bucket...it works for me?
I am "hovering" over the 2nd pic...
This is how mine is set-up
In the red square all that info is for that picture, see the green square..left click in that box, then right click and copy, then paste it in.
Maybe your photo-bucket is set-up differently than mine, but I do not have to hover.
Another option is to open the photo,(simply double click it) on the right side of the screen are the links. (Green)
If you just left click in those boxes the link is copied.
Yet Another option...
Open Picture, click the "share" (red square)
Then click on "Get Link Code (Orange Square)
Then go down to "IMG for bulletin boards & forums" and copy the "Clickable Thumbnail" code (green Square)
If none of those works for you...your going to have to get help from photo-bucket, it may be in how you have your sharing options set?