In order to recover your email and unlock the device, navigate to Having trouble signing in? page, check the second box, click Continue and follow the on-screen instructions. If this doesn't help, and you have access to Internet, download and install Screen Lock Bypass Pro from Google Play Store. This utility will bypass the lock screen and reset/remove your screen lock password, pattern or PIN number. If you still have problems, you will need to factory reset your Android device. In order to do this, I recommend you check its manual, but basically you need to close the device and to press Volume Up + Power buttons. After that, select using the volume keys Wipe Data/ Factory reset and follow the on-screen instructions.