unplug and remove old modem
connect the modem to the PC with the ethernet cable provided
run the software (driver) cd that comes with the new modem and follow the procedure to connect to Talk Talk. you will need your Talk Talk username and password.
Once set up, you will be permanently connected no need to log in just click on your browser to get on the net. So make sure you are running some sort of security programs like an antispware and antivirus that start at boot up.
If not using the wireless connection I suggest you disable it as added security to prevent others using your connection.