# Tutorial

- [Change/View/Revoke Token Authorization](/docs/metapath-user-guide/user-guide/en/tutorial/change-view-revoke-token-authorization.md)
- [How to change the authorized amount when using DEX](/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](/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.