have u not got an instructions ??
well u need to network it to both computers and then log on to it tho internet explorer. to log on you will need to know the ip address of the router, and then you will need to input the username and password.
for my make of router, the username is the make of the router and the password is "password"
edit:
http://www.broadbandreports.com/faq/eff#9 seems to have abit of information in it