I had the same question - and it took a couple of minutes for me to piece together the instructions JRobzilla gave...
The trick is to access the Settings from the App page. So...
Touch the App button (the little circled triangle) on your home screen.
Go to Settings
Go to Accounts
Select your Gmail account
THEN there are three selections (with check boxes) to sync (or not to sync - that is the question!) your Contacts, Gmail, and Calendar.
If you were like me, I was trying to access it through the Gmail app! That doesn't work!
Good luck!
Kim
The CPE Source - Unlimited Continuing Professional Education for Accounting Professionals