First, click the 'Your Events' tab on the left of your dashboard and select the event you wish to delete the tournament from.
In your Event dashboard select Orders from the Manage category.
To review a customer's order information before voiding, click the Cogwheel icon and select View order. Once everything is finalized, select Void order.
A prompt message will appear for confirmation. Click OK.
Once all paid orders are void, return to your tournament's Settings then Advanced Options and delete the tournament.