Need help understanding how to use simulated EEPROM

So a while back I got a Tau board which I’ve given up on getting the simulated eeprom to work on. So now I’ve purchased the SAMD21 board. Do I need to jump through any more hoops other than just including “#include <FlashAsEEPROM.h>” and making sure to call EEPROM.commit() to record the values?

Also does anyone know what the default frequency for the PWMs are… or which pins they are on the mini (are they the same as the non-mini)?

edit: I also couldn’t tell on the product page if the IO pins are 5v or 3v.