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You need to put them up for sale. Go to your Collection, then select the NFT. On each edition, you will see a little shopping cart. Click the cart, then in the top it will show your cart, there is where you will put a price on it and sell it.

Thank you, it worked. Is nfttunz - a previous version or a competitor?

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They are just another NFT marketplace. We don't really try to compete with anyone.