You will have to make sure the router is properly configured in the Basic Settings. Enter these by typing
http://192.168.0.1 in the browser address bar, username
admin,password
password For Supanet I believe the configuration is
VPI = O
VCI = 38
Type: PPPOA VCMUX
You will also have to enter your ADSL username and password into the router. These will be the same as the ones used in your USB modem, probably
not the same as your email.
It would probably be advisable to read the router user manual obtainable from
http://kbserver.netgear.com/pdf/dg834gt_manual.pdf