Set up MiminServer on QNAP

[PK4]

I set up the QNAP on my iMac. The albums I am transferring to QNAP's File Station (and picked up my Miminserver), are on an external hard drive plugged into the NAS by USB. All of this is very new to me, so while I am struggling a bit, I am happy to finally see some of my music via the Lumin on the network. What I can access on there reveals a lot of albums that have only one or a couple songs in them, and quite a few missing cover art. I'll have to figure out this 'tagging'. I just checked and MP3Tag for Mac costs $25. I'd spend the money if it sorted out all the missing files and files with missing data. But I am concerned about how to use it. None of the tasks in this NAS adventure have been easy. Is MP3Tag downloaded to the NAS? I read about it and what it does, but the MP3Tag website does not say how you use if or give any indication how easy it is for the layperson. Any thoughts? Thanks!