Lock up and stake
Using your wallet, send a simple transaction (often called “Stake” or
“Delegate”) to start staking. This locks up your ATOM (i.e. you can't
transfer them) and enables the chosen validators to operate the network.
Staked ATOM can be unlocked via your wallet by sending a transaction
(often called “Unstake” or “Undelegate”) and waiting 21 days.