I'm trying to point my dns to my google site. I have done the forward and that does not work. I get a blank page.
I've been through the help page at https://uk.godaddy.com/help/forward-your-domain-to-work-with-google-sites-6031
I've changed the A record to 184.108.40.206 as per the instructions for parking the domain
But I'm not sure what should go in the cname/www record
My google site is at https://sites.google.com/biocable.co.uk/archery/home (work in progress) but entering this into the cname/www field causes an error. sites.google.com does not cause an error but I get a 404.
I'm sure I am doing something stupid but I'm not sure what.
It sounds as though maybe you haven't updated the domain name in your Google Sites account yet. Typically, you would need to make sure that the URL is updated in your G Suite account:
Hope that helps.