Your URL should be http://localhost:81/starterkit-master without MAMP in the URL.
Mamp usually works with Kirby out of the box (even on Windows) and doesn’t require any additional settings (unless you have to increase your memory settings or something like that).
When I hit start I end up on the main MAMP page, so I type in the suggest URL in this thread http://localhost:8888/startkit-main and I keep getting this warning: This page is currently offline. We are very sorry for the inconvenience and will fix it as soon as possible. Advice for developers and administrators: Change the PHP version to one supported by your version of Kirby
What am I doing wrong? Do I need to change the PHP versions?
Thank you in advance!