Uh, I haven't even downloaded this yet and I am already confused as to how to get to the Hallow... I see no clear instructions on how to make the portal...

Just as a heads up the readme says to direct issues towards the new repo: https://github.com/AllOfFabric/The-Hallow/

I haven't used the mod, but just found this on the curseforge page which might help: https://streamable.com/o2rsq