The 'Attributes' card displays any Attributes that have been saved for the user and allows you to add new attributes or edit existing ones.
To add a new attribute, tap the + New button and enter the key name and value in the popup modal.
Attribute keys must follow certain restrictions, and some key names are reserved for RevenueCat. For a full list of key name requirements refer to the Customer Attributes guide.
Remember that all attributes are saved as strings, even if you enter a number. Read more about the restrictions on Attributes.