I can't add back my custom domain. Please help. https://i.imgur.com/3w5xlKy.jpg

Dear Mr/Ms I hope you have a nice day. Im texting you to ask if there is possibility to create a custom domain and hosted it in the NicePage Thank you Best Regards Aidar

why am I being told i don't have permission to change to a custom domain? I am talking about yorkprimaryschool.com. My plan gives me up to five websites. so I should be good