To add a network to MetaMask using Chainlist, you can follow these steps:

1. Visit Chainlist.org: Go to https://chainlist.org/ in your web browser.

2. Network Selection: On the Chainlist.org website, you will see a list of supported networks. Scroll through the list or use the search bar to find the network you want to add to MetaMask.

3. Select Network: Click on the network you want to add. This will open a page with more details about the network.

4. Connect to MetaMask: On the network details page, you will find a "Connect to MetaMask" button. Click on it to initiate the connection between Chainlist.org and MetaMask.

5. Confirm Connection: MetaMask will open and display a prompt asking for permission to connect with Chainlist.org. Review the details and click "Connect" to proceed.

6. Add Network: After confirming the connection, MetaMask will automatically detect the network details from Chainlist.org and prompt you to add the network. Review the information and click on the "Add Network" button to add it to MetaMask.

7. Network Selection: Once the network is added, you can switch to it by clicking on the network name at the top of the MetaMask interface. Select the newly added network from the dropdown list.

By following these steps, you can add a Scroll Alpha network to MetaMask or any other using Chainlist.org's integration. This method simplifies the process by automatically configuring the network details for you, saving you the manual entry of RPC URLs, chain IDs, and other network parameters.

Please note that while Chainlist.org is a popular resource for adding networks to MetaMask, it's always a good practice to double-check the details and verify the accuracy of the information provided by the website. Additionally, ensure that you trust the source of the network information before adding it to MetaMask.