# Tutorial

- [User Guide of how to revoke contract authorization for ETH chain NFTs](https://metapath.gitbook.io/docs/metapath-user-guide/user-guide/en/tutorial/user-guide-of-how-to-revoke-contract-authorization-for-eth-chain-nfts.md)
- [Change/View/Revoke Token Authorization](https://metapath.gitbook.io/docs/metapath-user-guide/user-guide/en/tutorial/change-view-revoke-token-authorization.md)
- [How to change the authorized amount when using DEX](https://metapath.gitbook.io/docs/metapath-user-guide/user-guide/en/tutorial/change-view-revoke-token-authorization/how-to-change-the-authorized-amount-when-using-dex.md): We will use Metamask wallet as example.
- [How to View/Revoke Token Authorization](https://metapath.gitbook.io/docs/metapath-user-guide/user-guide/en/tutorial/change-view-revoke-token-authorization/how-to-view-revoke-token-authorization.md): Users can always view and revoke contract authorization through the official block browser for each chain. Take ETH as an example.
- [SWFT 0-gas Swap Service](https://metapath.gitbook.io/docs/metapath-user-guide/user-guide/en/tutorial/swft-0-gas-swap-service.md)


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