You can stop the sale of your NFT or change the price on it only if the price is fixed. Changing price for items on the auction or stopping the auction is unavailable.
To stop a selling process, click on the Cancel Sale button below the item of your item page.
A confirmation screen will appear asking you to confirm the cancellation. Please note, canceling sale requires a gas fee to make the item unavailable to other users. Confirm the transaction. Now your NFT is not on sale.
If you want to change the price for your NFT firstly you need to cancel the sale. Then put the item on sale again with your desired new price and press Put On Sale.
If you want to start the auction, then click on the Auction button. Set the minimal bid and choose the duration of the auction.
The default options are 2 days, 1 or 2 weeks. Please note that you will not be able to cancel the sale until the end of the auction!