Admins use Assign Users to Groups panel to add members to a design group and assign Roles.
Or, from Administer Accounts, click the Users entry field to open the panel.
The email address may be listed in the pull-down menu if the user is already a member of another group.
The default role is Publisher. Use the pull-down menu in the Role field to change Role to Author or Reader. You cannot assign the Admin role to a member from this panel. Use Set up Account Admins.
Users must accept the invitation sent by email or by notification to their Start page.