said by Mele20 :

I hope your default user name was assigned by TW. If not, you are going to get a bill from AOL at the end of the month. You are required by TW to use the "special" version of AOL otherwise you are billed separately by AOL. The "special" version is the same as the "regular" version except it sees you, for billing purposes, as a Road Runner customer who had TW set up the free access. You don't have to use the default username. You can set up whatever screen names you want and use those. It is similar to the default Master email account that RR sets up for you. You cannot change that but you don't have to use it as you can set up other mail accounts with the names you want.