redirected site, now I'm logging in to 403

I redirected my site engagedscholars.com to engagedscholars.org . However, for now, I’d like to undo that redirect leaving the site at engagedscholars.com. When I login as an admin at engagedscholars.com , I hit “403 Forbidden | nginx/0.7.62”.

Any information for how to fix this would be hugely helpful. Thanks!