1. Go to https://7heaven.app/ press Sign In and connect your Metamask
2. Click Profile and choose an item you want to sell and click Put On Sale
3. Select how you want to sell your NFT: at a fixed price or an auction.
4. Approve in your Metamask wallet and wait for a few minutes.
5. To remove from sale - select Profile - Filters - On Sale - choose item - click Remove from Sale
6. To change the price - remove from sale first and then start from step 2.