It could take a few days for DNS to update and all that.
You can check that they're pointing to the right name servers through your my.vidahost control panel. Under "My Domains" you can click manage against the one you want to check.
They should be:
ns1.vidahost.com
ns2.vidahost.com
ns3.vidahost.com
From the email.
If you already own your domain or are transferring your domain to us, please set its nameservers to the following:
Nameserver 1: ns1.vidahost.com
Nameserver 2: ns2.vidahost.com
Nameserver 3: ns3.vidahost.com
Please bear in mind that nameserver changes can require between 24 and 72 hours due to DNS propagation and caching. Please ensure you have configured your account (uploaded your files, created email accounts etc) before changing your nameservers.
If you are transferring a domain, we will send a separate e-mail with further details. Transferring a domain doesn't cause any downtime, and is separate to the transfer of your website.
Sorry for sounding dumb, iam not quite sure what the next step is...
Dont I have too, go to go into the domain settings on 123-reg and set the DNS servers to the ones that vidahost supply me with?