WARNING: It's strongly recommended to not delete Sales Transactions because they cannot be recovered inside Triniq and also they will still exist in your PayPal/Stripe reports unless you delete them there also.
If you find a reason where you need to delete a sales transaction then;
1. Use the admin menu to navigate to Reports > Sales Transactions
2. Find the Sales Transaction you are looking to edit and click its corresponding link.
3. The edit Sales Transaction page will load and there will be a Delete button at the bottom right of the page.