Mumbai is not enabled by default on Metamask. We have to add it as one of the connected networks manually.
To use the Mumbai testnet with superfluid, you'll need a RPC URL to connect your metamask or application to a Mumbai node.

Network Name: Mumbai Testnet
New RPC URL: https://rpc-mumbai.maticvigil.com
Chain ID: 80001
Currency Symbol: MATIC
Block Explorer URL: https://polygonscan.com/
After completing these steps you can find the custom network in the dropdown list.
Once you’ve already integrated Mumbai Testnet in your Metamask, let’s get a faucet so you can explore our beta testing on Polygon Testnet. The faucet you are looking for at this point is Mumbai Matic.
Access the following website: https://faucet.polygon.technology/ and make sure the following parameter are set:

Thanks
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