This tutorial uses Mullvad VPN to show you how to connect yout Fritz!Box to a Wireguard VPN server and manage your entire network through a VPN.
For other VPN providers, the configuration steps may be different but the setup in the Fritz!Box remains the same
If you see this screen, check again if you have internet and if you are registered at myFritz , and then reload the page.
I have tested this with a Fritz!Box 6850 LTE with firmware 7.51 but it also works with all other Fritz!Boxes that support VPN (WireGuard).