Your master password can only be changed from the web vault.
Changing your master password will log you out of all bitwarden applications.
- Log in to the web vault at https://vault.bitwarden.com
- Click Settings on the sidebar
- Click Change Master Password under the Master Password panel
- Type in your current password, the new password you want, and then re-type to confirm
- Click Change Password
- Log back in to confirm that your new password is working
- Log out and back in any other bitwarden applications that you are using. You will eventually be logged out automatically.