Adding multiple sites

Hi,

I have installed wordpress locally using mamp for a site, however I now want to add another site to it but I cant see anywhere where it says ‘add site’ like it does on google. I only have the one option. I am not sure if i have set it up correctly and am very confused on if i am using the right wordpress. I installed www.remarpro.com.

I would really appreciate the help. thank you