If the chain you want to select does not exist in the Metamask, you will need to add the chain. Please see Metamask > Add a network using Chainlist on how to add a chain to your Metamask.
If the chain you want to select does not exist in the Metamask, you will need to add the chain. Please see Metamask > Add a network using Chainlist on how to add a chain to your Metamask.