Changing domain name

When I set up the hosting for my site I did not have the final domain name sorted out so the account was using a temporary domain name, in this case https://www.s487378786.websitehome.co.uk. I later transferred a domain name to the hosting package, https://www.visithuntly.net.

Now the site can be accessed using the new domain name but any other pages are showing the old domain name. I would obviously like all page urls to show the proper domain name. Where can I make the necessary change. (I am assuming this is an issue with WordPress and not the hosting provider).

Thanks.