What is the username and password for Minecraft?
you have to buy an account and create your own username and password
It is the Username that you sign into Minecraft with. It is also the name seen above your head in Multiplayer servers. The Password is the password you use along with your username in order to gain access to your Minecraft account and play Minecraft in browser. It would be a Minecraft Alpha Account if you bought the game between June and December 19th, 2010.