New authentication settings can be created by selecting Settings → Admin Authentication → Authentication settings and clicking the Add new button.
Each authentication setting has three editable parameters:
This field allows you to give authentication settings a descriptive name. This is the name seen in the Authentication group drop-down menu when you edit an admin account.
This field allows you to select the currently defined password authentication parameters. There are always at least two possible options, None and Internal password database. LDAP authentication parameters can be also selected, if any are defined. See Configuring LDAP Authentication Parameters.
This field allows you to select the currently defined certificate authentication parameters or None.