This is fully on the DRYVOX tracks in the template. If you are doing only solo vocals, DRYVOX 1 is the track you want that corresponds to the track selected in MAGMA (SOLO/Harmony 1 Dry Vocals). You must record this track with your own vocals (to be more accurate) and you must RENDER this track ONLY and use it when compiling in MAGMA. If you don’t want to record your own voice (you really should), then you can RENDER the main track as a 16 Hz Mono channel recording and use it as the DRYVOX.
For songs that have harmonies, you must use DRYVOX 2 for Guitar/Key to singalong and DRYVOX 3 for Bass to singalong. Record and RENDER the same way above. Also, HARM1 will be the track the lead vocal follows, so whatever is on that track is what the lead singer will be singing. You must also be sure to update the VENUE track when you want the other parts to be singing.
All this should be covered in the docs, so this is not a detailed step-by-step, but just a high level method of what you should be doing.
Good luck!