NS name record

Hi!

I brought my nameserver to another site but i cant delete here my linode nameservers. I read a post where someone asked a 2 year ago or something, staff answered in classic site still u can, but i couldnt connect classic site, and now my domain has 2 ip address, what i dont want :) of course.
How i can delete nameservers or change nameserver to my choosen one to connect my domain ?

thank you.