Before you can use the two-factor authentication, you must first enable this option in your Spotler account. You can do this in the settings menu of your Spotler account. Click on the menu at the bottom left and then on My profile.
In My profile you can see two tabs: Profile and Security. You will find the two-factor authentication under the tab Security.
As you can see, the two-factor authentication is still disabled. Click on the Enable button to enable the verification code. The Change two-factor authentication window will pop up, asking if you want to enable the two-factor authentication.
Once you click on Ok, the two-factor authentication is enabled in your Spotler account.
The next time you are logging in, you will first have to enter an extra verification code before you can access your account. This code is generated by an authenticator app on your smartphone. Search for "Authenticator" in the App store or Google Play and install one of the many authenticator apps on your smartphone. All apps offered in the App store or Google Play are suitable to use. All you have to do once you've installed the app, is activate the two-factor authentication for your Spotler account. You can find out how to do this in the article Activating the two-factor authentication.