You have 2 solutions:
Solution 1: Connect a Mac mouse / Open the System Preferences and click on Mouse (only when you connect a mighty mouse, for example) you can define the mouse buttons functions).
Solution 2: Install 3rd part driver like this: https://www.macupdate.com/app/mac/19058/steermouse
I hope it help you.
Best regards
or
Solution 3: Get a Windows or Linux PC. .... Sorry I just could not reset poking fun
doh I did not see Jay already beat me to the punch line darn!
"If I have seen further it is by standing on the shoulders of giants." Sir Isaac Newton, 1675