Avast Secureline VPN

I bought the avast antivirus and Avast Secureline VPN. I am running an Apple computer, when I go to the secure line icon to open it up. My choices are Show avast secure line window, and connect to optimal, which it won’t let me connect too. I also am having problems finding where the license key goes.

https://forum.avast.com/index.php?board=81.0