Changing Battle.Net Password

At the moment, Account Management may not be available due to maintenance, but once it's up - you can do it there - or from the recover password link on our front page.

In the meantime, if you've been compromised you'll want to make certain of your system security and that of your email account as well.

This may come in handy.

Account Hacked? Security Issue? Look Here!
http://forums.worldofwarcraft.com/thread.html?topicId=24702231244

You may also want to look into getting an authenticator for your account. It's no substitute for good security habits, but it will help keep them out of your WoW account.

Blizzard Store
http://us.blizzard.com/store/browse.xml?f=c:6

Mobile Authenticator
http://us.blizzard.com/support/article.xml?locale=en_US&articleId=26109

Q u o t e:
So i tried to see if it was up or not by logging in, but now i can't log in because i put in "Invalid Information" Is there still a way to change my password without logging in or...?

I suspect you'll need to attempt this once maintenance is done - most of the systems are unavailable at the moment.