AMP is the website server containing Apache, MySql & PHP core services. We use AMP to create our own host webserver on our hardware.
Mobirise is a tool for a desktop to create web pages and when you like what you see,
Preview and Publish
Click on "Mobile View" in the website builder to check how your site looks on different devices and publish to local drive, FTP or free Github Pages.
This Publish implies relocating from the desktop to the appropriate webserver; your server created with AMP or any other web hosting solution, such as GoDaddy.com or Register.com
Hopefully it is clear that AMP & Mobirise are not interconnected and do not (normally) co-reside on the same system.
Other similar web creation systems are Drupal and Wordpress.
To round out this topic, a standalone server is a great way to learn web programming; HTTP, HTML, CGI and backend programming.
I have Apache on my laptop for webpage development & testing; The webserver is configured to LISTEN on 127.0.0.1 port 80 so that means only the laptop has access to it. The trick is to modify windows\system32\drivers\etc thusly:
run ATTRIB -r hosts
edit it using notepad hosts
change the line reading 127.0.0.1 localhost
to read 127.0.0.1 localhost.com localhost
save it
run ATTRIB +r hosts
assuming you can get Apache configure, running and responding to a browser request http://localhost.com/
you can proceed with something like Mobirise to create web pages and Publish them to localhost.com
Just because AMP comes with MySql, does not mean you are required to configure and access it - - same goes for PHP.
Both of these are controlled in the Apache /conf area in httpd.conf
