Yes, you can resell your NFTs on the StockX platform. At this time, you cannot resell your NFT on other NFT marketplaces.
After the NFT appears in your portfolio, StockX will enable you to sell your NFT from your portfolio or on the product page. Like other items on StockX, you can sell by placing an Ask or by selling now to the highest Bid. Your number of active Asks may not exceed the number of editions you own of any NFT.