To ease setup, anytime you are setting up an email client you can select GMAIL as the service provider (SNP Email runs on Gmail)
If you have an iOS device (iPhone, iPad, etc) then follow these instructions:
https://support.apple.com/en-us/HT201320
If you have an Android device (Samsung, Motorola, LG, etc) then follow these instructions:
http://gappstips.com/android/android-gmail-setup-instructions/