how to let registering Blog URL dropdown show at home page

Dear Sir,

I have wpmu and bodypress with multi-domains plugins, have lot of domains alreadly add to the multi domains plugins.

I want to show the list of available domains on network, checks for the domain availability in my multi-domains plufins when you are registering it,could regist subdomains.

that is alreadly in my

How to easy show/display it to home page, let the user easy see it, take domains then keep to register page.

Thank you!