After tailscale is done installing, you should get a "Tailscale Authentication needed" notification at the bottom right of your screen. Click on it and log in.
Add your device to your tailscale network by logging in.
You're good to go.
Install in one command.
Enter this in terminal:
curl -fsSL https://tailscale.com/install.sh | sh
and then enter this:
sudo tailscale up
You can view your tailscale ip address by doing:
tailscale ip -4
VOXL2
Follow the setup guide here which will also initialize tailscale.