Walter
The only computer I've ever owned is a MacBook Pro and as Brett stated, all the photo editing tools reside in the 'Pro. The photos
I load onto the forum are sized and altered with the internal program. Not sure what the GraphicConverter program is, but I looked it up and it seems all the functions it provides are already built into your MacBook Pro.
The easiest way to sort out the Mac photoshop app is to take yourself and your computer to the Apple store and ask them to show you how it works.
Ara