To unsubscribe from the Sync subscription service you can do that by following these instructions
- Launch the Settings app on your iPhone or iPad.
- Tap on iTunes & App Store.
- Tap on your Apple ID at the top.
- Choose View Apple ID from the popup menu.
- Enter your password if/when prompted and tap on OK.
- Tap on Manage under Subscriptions
- Select Timesheet by Zed and turn off the Automatic Renewal