Go on the 'Offers' tab in your Back Office:
Or go on this link:
Then, click on "Create an offer"
Let's say that the product we want to sell is an iPhone 7 128GB Black - Unlocked.
Look for the product using the search bar:
The product exists. Click on 'Sell yours'
If your product doesn't exist in our catalog, you can create a new product. You can read the article Create my product on Back Market's Back Office to have more information.
Set all the fields related to your listings:
If all the fields are filled correctly, with a stock above zero, your listing will go live.