How can I connect host on my Mac to the server on a raspberry pi? Or do I have to setup the server on my Mac? Can I access server on a raspberry pi from the server on my Mac ?
The mac host can not connect to repetier-server. You need to use either the web interface or if you have a pro version you can use Repetier-Server Monitor to control your server instances with a real app.
You do not access instances on other pc with any instance. You always enter the ip:3344 in your browser to open the server interface. So it is accessible from any device in your intranet. You can however tell the pi in global settings->Communication to use the mac for slow operations like rendering and video conversion.