Can’t find Roon Core using Roon Arc: Need Help with Tailscale

My ISP uses CG-NAT from what I have gathered the information and it’s not possible for them to remove CG-NAT, asking me to pay more for a static IP.

I have read the workaround using Tailscale, is there any documentation on how to do on a PC? I read the linked article and still confused. Thanks. I use this link in particular and get confused along the way.