Open it and tap the 'Force stop' button, then the 'Clear data' button, and then the 'Uninstall' button.
Now go into your Tab's Settings menu, start up the Application manager, and find the Malwarebytes app in the list. Disable all its features, especially those auto-detection and constant monitoring options. Start up the Malwarebytes app and go into its Settings menu. You might need to completely remove it before re-installing the free version.
