You can of course use the list provided with the schedules or there is also the ability to register as a spare or find a spare in the members section of the website. Glooscap Curling Club has a YouTube video explaining the process to do this, which can be found HERE.
To Find a Spare
Login to the members section, from the MEMBER'S HOME menu at the top of the page, under LEAGUE INFORMATION, select Finf A Spare, the select the league you require a spare for. The list of available spares will be shown with contact information. You can also email them directly from the website.
You can also list the available time you are able to spare. From the MEMBER'S HOME menu at the top of the page, under MEMBER INFORMATION, select My Sparing Availability. Here you can select which leagues you are able to spare in and list the positions you wish to play. If for some reason one week you are not available you can take you name off the list for that week.