Zyxel EMG2926

Hi.

Trying to acces the router at 192.168.0.1.  The back of the modem says username is 'Admin' and Password is 'keep blank'.

This does not work.  I've reset the modem numerous times, but still cannot get access.  I've put in different combinations of usernames and passwrods from the Zyxel website but no luck.  

Can anyone help me out?