Domain Names (Multisite)

Hi all,

I’m want use various domain names on my multisite installation but I can’t seem to figure out how or where to put the domain name. When I click “New Site” I get the following “domainname.co.uk/then a box to fill in more characters” I want to use multiple domains, ie,, 123abc.com or maybe abc789.co.uk, please can anyone help?

Thanks,

Steve.