you must start do setup option .
read the documentation came with your modem ,generally ,.. they configure the modem by defult with IP address 192.168.1.254 .so connect the network cable to the modem ,and open explorer .form address bar ,type 192.168.1.254 ,the page of speed touch will appear ,click on speed touch icon and do setup from the options bellow .then the pages will show you how to do configuration step by step.
firstly the name of your network and the password you want to configure it in your speedtouch modem.
but .if you want to configure password in the modem taht connected with ISP ,you must have username and password form ISP company to enter to configurartion page .
you can ask me again if you have any question .