Hello @Wise

It's called the 'Account Notifications' menu and it can be found here: Studio > Navigation app > Menus > System > Account Notifications

Or Studio > Navigation app > Items > System > Account Notifications or you can access the following URL:

Yourdomain[dot]com/studio/builder_menu.php?page=items&module=system&set=sys_account_notifications

Please replace Yourdomain[dot]com with your actual domain name.