If the customer's account is unclaimed (you'll be able to see at glance if an account is unclaimed because there will be an 'Unclaimed' pill next to their name, as seen below)
you'll be able to edit their email address by clicking into their profile >> clicking the 'Account Management Settings' button and then editing their email address.
If the customer has claimed their account, the option to edit their email address depends on if they belong to multiple TeamUp businesses or only one.
If they only belong to your business, you can edit their email by clicking into their profile >> clicking the 'Account Management Settings' button and then editing their email address. Please note that they will need to accept the invitation to manage their account again at the new email address.
If they belong to multiple TeamUp businesses, they will need to edit their email themselves by logging into their account.
Customers can change their own email address by logging into their TeamUp customer site on a mobile or desktop browser >> My Account >> click on their profile >> Edit next to Email >> update their email.