Once an NFT has been minted and posted to the Educoin marketplace it can be managed via the account section of the application. By clicking the dinosaur icon an upgraded user will be taken to the account page where they will be able to manage their active listings.
From the account page select "manage listings" on the left hand panel to access and manage their current listings.
Options for listings:
1) By entering a new price into the "Change Pricing" box a user will be able to save a new price for their listing.
2)By selecting the "cancel listing" button a user will be able to remove their NFT for sale from the NFT marketplace.
Video of process here.