unable to link a WordPress Custom Domain to my deployed Railway App

Project ID: fc3fef1f-b589-4f3b-a1b1-eb4315dd423f new developer here/apologies if this is the inappropriate channel? I have built and deployed a simple website on Railway and have added the custom domain on my project. The issue I am having is at the Domain side, adding the host details (ie CNAME) - I assume the way this entered is incorrect. What are the correct values to input? Do I need to use a CloudFlare DNS resolver instead to connect the custom domain and my website?