separate domain name for each site?

hi guys

i have a WP multisite and the multi domains plugin and would like to have a separate domain name for each of the sites i have so far, for example:

https://sportip.biz/wp/ff — to be — https://footballfocus.biz
https://sportip.biz/wp/rc — to be — https://rugbyclub.biz
https://sportip.biz/wp/sipuk — to be — https://sportinprofileuk.biz

im not planning on having users creating their own blogs or anything, i just wanted to consolidate all my own sites into one WP install.

Ive installed the multi-domains plugin but when i goto add a domain name it seems i can only use them for creating new sites, and even then it looks like it has to be domain.com/newsite

anyone know what im trying to do and can help??

thanks