Need to change domain of my website

Hi folks

I have this website: https://www.getonlinewithdean.com.
I want to change the URL to https://www.jamesperryexamcoaching.com

Trouble is https://www.jamesperryexamcoaching.com is hosted by WIX.

Any idea what I need to do.
I have logins for both domains

Thanks for any help you can give

Dean