Can't use Authenticator

Hello,
I downloaded the authenticator on my LG K20. I have Lucky mobile services. I logged in on my Blizz account but i keep blocked at “Configuration…” with the little blue logo moving. After minutes i’m still at that step. What i can do? Why it’s doing that?

Thanks

Try clicking the back button on your phone, it should pop up a browser window and in that window it will require you to log into a blizzard account and then take you through the steps to set up the authenticator, at which point you can go back into the authenticator and it should start working.