Toast v 1.9.3 allows users to easily edit the customer information on file for their Gift/Rewards Cards via the online Cards report.
Multiple search criteria can be used to find the card in the report. Recommended are the 16 digit Toast Card Number (if available) or, if it is a Rewards Account, the customer's email address used to register.
Once located, the card entry can be moused-over and clicked to open the Card Details window. (below)
In the example below, the ability to edit the info is in the top half of the window.
Be sure to save changes before exiting the Window.