Hai
you success made as manager login name.
please login from your browser with this address http://your-router-ip/userman
and config your userman with that web interface, don't forget enabled www at '/ip service' submenu before action it.
on web interface many tools, don't worry many tools
Use this guide to enable User Manager login, http://wiki.mikrotik.com/wiki/User_Manager/Getting_started
Login/password for User Manager web-interface is configured at ‘/tool user-manager customer’, it might (should) be different from router login/password.