You associate data access permissions with a user or group account by first displaying a list of namespaces and then selecting the ones for which you want to specify data access permissions. After selecting the namespaces you want, you select the permissions you want the user or group account to have for those namespaces.
You can specify permissions for any number of namespaces in a single operation. If the user or group account already has permissions for any of the selected namespaces, the set of permissions you select replaces the set of permissions already associated with each of those namespaces.