Please share your views regarding EVO pocket wifi 3.1 mb

HI everyone. A friend of mine has purchased an EVO pocket wifi but is not able to change the password of the device. Can you tell how it can be changed, we tried changing it from the user interface in the PC but it doesn't give any option other than to change the modem password.

Also, which network is best to use for good signals, EVDO, 1x and hybrid?

Please share your views, thanks in advance.