You can log out of your account from your My Page.
Method of operation
Log out of ovice
1. Tap the My Page icon at the bottom of the screen
2. Tap "Log out"
3. Tap "OK" when asked "Do you want to log out?"
4. Go to the login screen at the entrance
Log in as a different user
After completing the steps above, log in using a different email address and password.