Did you forget your lock screen code? Since UMX phones are Android based, You can try resetting it by following instructions on screen to input your email and it will give you instructions how to unlock. But if you still cannot bypass it, hopefully, you have a back up of your phone since you might need to do a reset.
The key combination to enter recovery to reset your phone is: Volume UP/Down + Menu + Power button. In some cases it's just Volume Up/Down + Power button. Once you are in recovery select Wipe Data and restart your phone.