wireguard successfully installed, but where to go from here?

interface: wg0
public key:
private key: (hidden)
listening port: 51820

peer:
allowed ips: 10.9.0.2/32
root@DietPi:~#


I removed the keys, but it seems like the connection is established. pihole has all permits, yes. DNS was set in router, not in wireguard.