Can not access my domain "readiningc.org"

I had the domain mapping plugin installed on my site.
readinginc.org
I actually have 2 other fully resolved domain sites that I have not connected to my readinginc.org site until today.

While tooling around I clicked on the domain mapping plugin and filled out a couple of pieces of information but never identified which domain site to map.
The sights are all on the same server.

But now I can not access my primary sight. readinginc.org.

Please Help.
I give you full permission to access the back end of my sight. Do not remember if access permission on the dashboard was checked.

thank you