Point Domain to Folder

I have just purchased a domain through DH and want it to point to a folder.

I already have a domain hosted elsewhere that is pointed to the main account but want this new domain to point to a folder as a separate site. (on the same server)

For instance:

My main account in warringtonwarrior.com I want the new url to point to warringtonwarrior.com/Steve/ and the new domain (which is stevesradiatorrepairs.com) to only show what’s in that folder as the site stevesradiatorrepairs.com .

I know I am confusing and hope someone understands.
Can someone explain how to set this up in the easier possible explanation please?

EDIT: NM got it figured out. Tried to delete this post but it said I don’t have permission too.