suliforshort on "Updated Domain Name Pointer, now I get 500 Error When Clicking On Post, HELP!"

So I recently bought Suli.Land as a domain and set up Wordpress using Network Solution's provided install. Everything works fine until I decided to change the Domain Name Pointer from Suli.Land/wordpress to Suli.Land. Now my posts, media & pages lead me to a 500 Internal Server Error page.

I think it's due to the pages, media & posts still having a suli.land/wordpress in the URL, but I don't know how to change them to where it's functioning properly again. Help!