The user "admin5" was configured with privilege level 5. In order to allow configuration (enter global configuration mode), we must type this command:
(config)#privilege exec level 5 configure terminal
Without this command, this user cannot do any configuration.
Note: Cisco IOS supports privilege levels from 0 to 15, but the privilege levels which are used by default are privilege level 1 (user EXEC) and level privilege 15 (privilege EXEC)