Prerequisites

Install the Google Authenticator app on your mobile phone.
Download and install the app on your Android device or on your iPhone, iPad or iPod Touch.
You need to be a verified OpenSpecimen user.
You secret code would have been emailed to you. If not, regenerate the code or ask your administrator to resend it.

Procedure - First time user

Open the Google Authenticator app on your phone.
Enter the secret key you received from OpenSpecimen
Google authenticator app will now show you the One-Time Password (OTP).
Goto OpenSpecimen login screen. Enter this OTP along with rest of the login information.
You should be able to successfully login.