Use Image tags.
[IMG]http://AddresstophotoendinginJPGorBMPorWhateverHere[/IMG ]<~ Without the space
On the photobucket website, they give you the four options to cut and paste to the right of the image. Use the one Labeled IMG code
Example.
[IMG]http://img.photobucket.com/albums/v122/Phreakonaleash55/Permanent%20stuff/IMAG0075.jpg[/IMG ]<~ No space between the G and ]