Registered domain with DH, hosting elsewhere

I didn’t see a topic like this one… pardon me if it’s been covered before. I registered a domain on DH fully intending to host it here. The guy I’m doing the work for decided he wants to host it elsewhere. They’ve given me the NS data to point the domain to their server, and I’ve found the page that lets me put name servers other than DH’s, but it doesn’t seem to be taking… there are a ton of DNS records in the non-editable section that I need completely eradicated. Any help for this n00b would be appreciated!