How to change WHOIS contact details?

[#1]

Is it possible to update the WHOIS contact details? For some reason its using my old email address and I want to turn that off in the not too distant future...

[#2]

you should be able to do it through http://www.nominet.org.uk/

[#3]

Quote from: dvorak

you should be able to do it through http://www.nominet.org.uk/

Since my domain is a .net, I'm guessing nominet.org.uk wouldn't be handling it. Looking at the whois details, it looks like its been registered via eNom - a reseller for Verisign. In any case, I haven't got any login details for nominet, eNom OR Verisign!
Just to clarify - the domain was registered via Plus.Net and the domain is only a few weeks old. It took a while for the domain to get registered for some reason.