How do I remove an account from my phone

I want to use a new account but I cannot sign out from the account I use now and cannot uninstall app too
The password that I sign in cannot use to sign out

Hi Nozomu,
Do you sign in to AirDroid via Google/Facebook/Twitter? There should be an AirDroid password the first time you sign in via Google/Facebook/Twitter. If you forget the password, you may reset it here and try again: https://id.airdroid.com/user/sendresetpwmail.html