Denzel Chia
Moderator
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#22190 |

Hi,

This question is not related to our product.

You should post it in WordPress Forums. https://wordpress.org/support/

It’s difficult to setup multi-site with domain mapping, if you are not a programmer.
Domain mapping refers to having your own domain name that resolves to theirsite.mysite.com.au

If you can fully understand the following two articles, then you can try to create a multi-site.
http://codex.wordpress.org/Before_You_Create_A_Network
https://codex.wordpress.org/Create_A_Network

Thanks!