Set up Metamask on a desktop browser if you haven’t already.

Connect to Mainnet Rinkeby.

Get Rinkeby ETH. Use a Rinkeby faucet while connected to Rinkeby with your Metamask wallet. Here’s one.

Visit the Arbitrum bridge. Your Metamask wallet must be connected to Rinkeby Test Network. Using the bridge, deposit your Rinkeby ETH (it will be sent to the Arbitrum Rinkeby network).

Add Arbitrum Rinkeby to your Metamask network list.

Connect to Arbitrum Rinkeby. You can now use the Shell v2 testnet.

To receive test stablecoins, use the ‘faucet’ tab and claim your allocation.

You can start using all of the new testnet features now.