Go to "Artworks" option in the main menu, select "Artworks on Sale". Use filters at the right and at the top (style, genre, price, period etc.) - this way you will save time and find exactly what you need.
Go to the artwork page and press the price tag in the bottom right corner. The artwork will be added to your cart and you will be able to proceed with the purchase or start a conversation with the seller. Use templates to ask for a discount, make your price offer or request more details from the seller.
If the artwork you want to sell is not listed among your artworks, add it via artwork addition form (see "Content" chapter). Do not forget to indicate that you own the artwork and flag "Put on Sale" option. Indicate type of sale, payment and delivery parameters and save. If you have added the artwork before and now want to sell it, select "Artworks" option, put a cursor on the artwork and press a gearwheel pictogram. Select "Sell" in a drop-down menu and fill out required fields.
In case a user added your artwork to their cart and initiated a purchase or sent you a message, you will get a notification, and a red number (1, 2, 3 - corresponding to the number of artworks and buyers) will appear by the User menu. You can go to the Sales chapter and start a conversation with a potential buyer to discuss the deal.