What this means is that you either pay Photobucket a monthly amount to host them - or you need to move them! I've moved mine to Flickr, and here's a video on how I did it.
It's really important that you pay attention to the coding - and be very careful not to delete the " symbols. Don't leave any spaces between the symbols either!
Note: I've also posted this on my 1stfloorflat blog.