I keep getting an error message that my user name or password are wrong for my .mac (or .me) account are wrong and it won't receive emails. only send them.
I have checked both in the settings, nothing is working. On my phone, pc, Ipad, nothing. Does this mean my Mobileme subscription is out of date or something?
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It’s possible. The first thing to check is to try to log in to me.com. If the password you assume is correct works there then the next step is to delete your account from Mail.app then re-add. If that does not solve the issue then the next step would be to delete the keychain holding the old mobileme password.

If the password does not work in the first place, then you’ll need to reset it at iforgot.apple.com.