Tips and tricks
How to allow wordpress to work on nginx MAMP PRO
You will have to edit the template accessible from the MAMP PRO > File > Edit Template > Nginx
you should add
location /wp { index index.php; try_files $uri $uri/ /wp/index.php?$args; }
under the server which interests you
you can also place it under your location/ for multiple installations
location / {
try_files $uri $uri/ /wptest/index.php?$args /wp2/index.php?$args; }