This blog post talks about my recommendations during implementing the Google Authenticator for Multi-Factor Authentication in Kentico following the Kentico DevNet article that was provided.
It also assumes that you have the Google Authenticator Application installed on your device.
We were required to have Multi-Factor Authentication on a particular Kentico site, which was a part of other sites in the same Kentico installation. So we couldn't just apply this work globally to all sites, as only one of them wanted this particular authentication process.