HELP! Wrong Site Address

I am building a website here: https://prezenceconsulting.com/northstar/ and had the whole thing complete. I am eventually going to point a different domain (https://www.northstarrealty.com/) to this site. I accidentally entered in the https://www.northstarrealy.com into the Site Address in the General Settings before everything is set up, and now I can’t get into the wp-admin on prezenceconsulting.com/northstar/ and the site is TOTALLY screwed up, as you can see.

I desperately need help ASAP. Please please help me…