Is the Actiontec Gateway Password the Password used to join the network? If not then what is it?

I'm trying to opened a Minecraft server and setting up my internal for the router. I have Telus and I managed to access the account. It keeps saying my password has expired. It's asking for my serial number and a new password but I want to keep the original password. If somebody can confirm what the password is then I'll be able to do this with out any trouble.