Extract the contents of the release zip file to the apps directory on your SD card.
Copy your zipped or unzipped SMS/GG roms anywhere you want on the SD card..just remember where you put them.
DrSMS should now appear on your Caanoo APPS menu, select it to launch it.
The menu is pretty straight forward, just go to the SMS or GG rom select option.
Browse to where you stored your roms and select the game you want.
In Game Keys
UP/DOWN/LEFT/RIGHT = SMS UP/DOWN/LEFT/RIGHT
X = SMS Button 1
B = SMS Button 2
I - SMS Pause Button / GG Start Button
L - Quick Load
R - Quick Save
Home - Enter Menu
Thats about it, just leave a post here if you get stuck and someone will help you.