If you need to create a new backend admin user, the following command will help you.

• Open a new terminal window, and go to your project root directory.
• Type the following command(using php7.0):
  
  1	php bin/magento admin:user:create --admin-user='new-admin' --admin-password='yourpassword' --admin-email='info@domain.com' --admin-firstname='Phil' --admin-lastname='Collins'