See the following support document for how to rip CDs into the Music App or iTunes app music library.
click here ➜ Import songs from CDs into Music on Mac - Apple Support
Once ripped, you will need to copy the files generated from the rip onto the iPad into a location the mconnect app can access. From what I can see mconnect cannot directly access the Music App Library on the iPad, so a traditional sync would not work, and you would need to copy the music either directly into the mconnect app or a folder in the iPad's Files App.
click here ➜ Use the Finder to share files between your Mac and your iPhone, iPad, iPod touch - Apple Support
Once that is done, and the mconnect app can see the music, you can use whatever method the mconnect app has to transmit the music to the destination amp or speakers.
Check mconnect's user manual for specific steps.
https://www.conversdigital.com/eng/product/product04.php#id_002