A friendly email address is an alternate forwarding address that can be added to the list of emails attached to your waterloo email. Emails sent to your userid@uwaterloo.ca email address or your friendly email address will both direct to your uWaterloo inbox.
Log into WatIAM here: https://idm.uwaterloo.ca/watiam/login.jsf?prompt=true
Perform DUO Authentication
Click Manage Email Settings
Click the Friendly address radio button
Click Submit