From the touch install manual
SETUP MENU > AIRCRAFT INFORMATION > MAINTENANCE LOG o > LOG ITEM x
▪ > NAME (user-defined text, up to 14 characters)
▪ > TIME BASIS (NONE | DATE | TACH | HOBBS)
▪ > END TIME, HRS (if TACH or HOBBS was selected) or… > END DAY, END MONTH, END YEAR (if DATE was selected)
once you get into the maintenance log, there will be LOG ITEM (number) not text and you can not change this if that is what you are asking.
you can change the NAME with whatever maintenance item you want OIL, TIRES, FILTER, etc.