If the Sale button appears grey, you will need to make sure that you have one of the following items added on your account.

If a Credit Card or Bank is not on your account, you might experience an issue listing your NFT.

If you have a credit card and or bank added, but the Sale button still appears grey, it means that even though the NFT is in your account,  it is still writing on the blockchain.  Once it processes on the blockchain, it will be listable.

*Please note if you live in New York, you will be required to add a bank account to list your NFTs in the marketplace.