First of all, the link you provided us is incorrect: you left out the letter "t".

As far as image resizing: Photobucket, as far as I'm able to tell, only resizes to thumbnail or avatar dimensions. You would be well advised to get your own software; I use Paintshop Pro, not quite as pricey as Adobe Photoshop and with most of the same features. An excellent program, Irfan View, is available as a free download. Google will find it.