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Connect to second modem and log in.
Go to Advanced local Network and scroll down to Mode.
Select Bridge mode and select confirm.
Modem will reboot.
Connect WAN port of second modem to LAN port of first.
Note internet/online and phone light will be off but should have internet access through both modems.
I am trying to find Advanced local Network also when I try to log in from here its asking for a username and password which one are they referring to?
I assume that is the advanced settings page of the first modem. Local Network is on the left of the second row from the top. By default there is no username and password on the TG799. If the second modem is asking for username and password then some one must have set up a username and password. To set second modem back to factory defaults press reset button for at least 10 seconds while modem is powered on. This should remove the password. You will need to use a bent paper clip or similar device to press reset button on modem.