In the Tim Hortons app:
1. Open the Tims app.
2. From the ‘Home’ page, select the "Rewards" tile.
3. On the ‘Details’ tab, tap the ‘Round Up for Tim Hortons Foundation Camps’ button to turn it on or off.
On the website:
1. Visit timhortons.ca and sign in to your account.
2. Click on your name in the top-right corner of the screen to open the ‘My Account’ menu.
3. Select ‘Tims Rewards’.
4. On the ‘Details’ tab, click the ‘Round up your order for Tims Camps?’ button to turn it on or off.