Go to https://wallet.keplr.app/chains/dymension,search for Chorus One from the list of validators, and click on it.
Go to https://wallet.keplr.app/chains/dymension,search for Chorus One from the list of validators, and click on it.
Enter the amount you want to stake (leave some amount in your wallet to pay for the fees)
Connect your wallet
Click on Delegate and then Approve the transaction in your wallet/ledger. You're now staking with Chorus One!