The MatchTrak system is different than SchedulesEtc. Here are some quick and dirty notes:
Youtube Matchtrak video training video: https://www.youtube.com/watch?v=TtSb59i9XBY
Schedule Review and Removal
There is a section in the upper left under My Data where you can look at your past, future, or entire schedule. Click on the "Pending Games" option to look at your future games. Click the edit icon of the game you wish to cancel. This can only be done until 11:59 pm on the Wednesday before a game. Near the bottom of the screen should be a button labelled "Cancel Reservation". Click on the button and click the "Cancel Reservation" icon and you should be removed from that game.
If you need to cancel after 11:59 pm on Wednesday, then you will need to contact the Region 213 RRA or ARRA.
If you have any comments or questions about MatchTrak, then please let me know, and I will attempt to get you an answer.
Referee Scheduling Page (and the Schedule Links)