You can not. Because of two simple reasons: 1. Minecraftforum doesn't support the deleting of accounts, and 2. You don't need to. If you simply just leave your account like it is, you won't get into problems with it.
If you want to delete it due to personal information, you can edit it in your profile page. Else, there is not a good reason to delete your account. If there was an easy way, some people may find it funny to try and find the passwords of others and delete their accounts, so bad idea having that function.
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No
Unfortunately, there is no current way to delete a minecraft account. Unless, of course, you email the developers.
go to mojang support center and look up in the bar above your screen "how to delete my mojang account"
You can download it of the official minecraft forums.
It means, that your account is hacked. delete your .minecraft folder (backup save files) and change your password on minecraft.net. Redownload minecraft and it´ll work.