When I try to play multiplayer I type in the only server I know, which the game says was right, then click Play and it loads. Then it says Can't connect to server: bad log in. How can I fix this?
You will get a “Bad Login” error from a specific server if that server can't reach
minecraft.net to verify your account.
This means that if the server has a hard time connecting to
minecraft.net (either because
minecraft.net has just gone down, or because the server has an unreliable network route to
minecraft.net) even if you have no problem connecting to
minecraft.net to login to your account initially, then you will get intermittent "Bad Login" errors from the server that's having network problems.