Navigate to the Users section in the left pane of the Admin Console, then choose the specific user for whom you wish to configure the email alias. From the top menu on the user’s page, select Mail Settings. On the left-hand menu, click on Email alias. Enter the desired alias username and select the domain you want to associate with the alias, then click the + button. By default, all emails are sent from your primary email address. If you want to change the primary mailbox address, hover over the created email alias and click on “Set as mailbox address,” then confirm the change by clicking “Change” on the pop-up confirmation.