To enable 2 factor authentication on your account for additional security, head to the top right menu my profile' and then you'll see in this line whether or not 2 factor authentication is already enabled.
Click the pen icon and you'll be taken to this page. You'll need to install an Authenticator App from the App Store, and then you need to add a new application.
Scan the QR code with your authenticator app, then enter the code that's currently displayed for DroneDesk. Enter your password, and click enable 2FA.
Now when you go to log in, once you enter your email and password, click sign in. You'll be prompted for the 2 factor authentication, which you'll get from your authenticator app.