Simple steps to enable MFA on your Google Account (Gmail, Google Drive, etc).
Click on profile pic above on right and Click Google Account
Now Click On Signing in to Google
Click on 2-Step Verification
Click Get Started and Authenticate with user and password. Get the codes via text message or call.
You will get an OPT on your mobile. After verifying OPT Turn On 2FA
Click Authenticator App to get QR Code.
Select your device Android/ iphone
Setup the Authenticator with Code and Click on Verify.
Logout and try login to gmail / Drive, you will be prompted for MFA code with username and password.