In the release flow you will see an input next to the editor labeled Royalty. You can set a resale royalty percentage for the NFT anywhere between 2.5% to 50%.

Cent contracts follow the ERC-2981 royalty standard: https://eips.ethereum.org/EIPS/eip-2981. It is up to each platform to respect the royalty percentage set on an NFT and collection. If a resale happens on a third party platform we cannot guarantee that the royalty percentage will be respected.