Enable 2-Step Verification to secure your account (also known as 2FA or two-factor authentication)
2-Step Verification Setup
Step 1: Navigate to your Profile (Edit profile) and check "2-Step Verification"
Step 2: Download and install Google Authenticator app (available for iOS and Android) on your mobile device. Scan the QR Code in Google Authenticator to generate a six-digit security password which changes every 30 seconds.
Step 3: Enter the six-digit password from Google Authenticator to activate 2-step authentication.
Step 4: When logging in to your account, you'll need to use except of your username, password also the six-digit security code from Google Authenticator app.