If you're looking for more content from SidelineSwap, or hoping to unsubscribe from certain notifications, you can easily do so from your settings on the website or app. From sidelineswap.com, simply click your account icon in the top right corner, then "My Settings".
From there, you'll see an option on the menu on the left for "My Notifications" from which you can turn on or off most notification types across email, SMS, and push.
The experience on the app is very similar. Simply go to the Account menu on the bottom right. From there you'll see an option for "My Notifications" where you can update your preferences.