Modifying game lobby

[Mira Mathers]

I was trying to modify Game Lobby coding so that the output can save the information into a txt file. However, i was able to save it into txt file, but I don't wanna overwrite the existing information that i've saved before..Everytime i run the cmd, the previous information doesn't appear.Apart from storing information, games can also delete the player's name in the database.
Games will also display information on the display cmd using ifstream statement.
I wasn't able to get that result.. Need some help..