Follow the steps below:
Step 1: Go to your SeatGeek Account Manager and select the “Sell” option next to the event you’re looking to sell for.
Step 2: Specify a quantity, listing price, and ensure you have a payout method and credit card entered.
Step 3: Hit the green “List Tickets” option at the bottom of the screen.
Step 4: Your tickets should now be listed on SeatGeek.
For a visual guide and additional info, please visit this link