-
Choose Permissions for this list/library.
-
On the page that opens, choose Stop Inheriting Permissions on the Permissions tab, and then choose OK on the confirmation prompt.
-
Choose Anonymous Access on the Permission tab.
-
On the Anonymous Access form that opens, select all of the permissions that that users of the app for SharePoint require. You can grant permission to View, Edit, Add, and Delete items. You cannot grant Full Control, so anonymous users cannot change the schema of the list or change list settings.