If using one or more table-driven user-defined fields in your user records, your administration options will also include Administration > Users > User Defined Fields. This is where the drop-down values for these fields are maintained. Within the User Defined Fields sub-menu, select the option that corresponds to a field’s label to maintain its values. This will open the <Field Label Name> List screen.
From here, you may select the Add option that appears below the field’s sub-menu option to add a new value to the field. You may use the “edit” or “del” links next to an existing value to edit or delete the value.