SuiteCRM issues to the first login

Dears ,

im trying to test the suiteCRM but after download it and i can access the UCS and the login success as i was entered in the setup steps ,

after access the UCS and access the Administrator privilage open SuiteCRM application but the user name and password not work ,

what is the default for the first user name and password ,

Best Regards ,
Zaid Gheidan