Here is the link to our FAQ section that explains it.
Photobucket may change how their screen looks, but this should give you the general idea. When you view your picture, you can “Edit” the file to resize it. Please make it no larger than 600 px wide.
If you have questions, please email me directly at email@example.com. I’m happy to resize the picture(s) so you can link them as attachments in your post. There is also a very long thread here about photos in the forums.