Steps on how to add another email address or merge two Piazza accounts
Step 1: Click the gear icon, then "Account/Email Settings" in the drop-down:
Step 2: Under the "Personal Settings" header, click + Add Email to add an email address or to merge your accounts:
Note: You can log in to Piazza with any email address.
Step 3: After you save your settings, you can select a preferred email address:
Adjust your email notification settings for your preferred email address!