First go to Terra Station and select Staking to the left of the screen. Next, choose the validator that you wish to redelegate some of your LUNA stake to. This could be a completely new validator for you, or an existing validator that you have already staked some LUNA with.

How do you Unstake Luna?

Select the delegator you want to undelegate from, and tap the “Undelegate” button. Once you send this transaction, your Luna will remain locked and unstaked for 21 days. Want to redelegate?

How do you delegate Luna?

Redelegating from one validator to another is just as simple as delegating. Select the new validator you'd like to delegate to, and tap “Delegate”. You can easily re-allocate your stake without having to wait 21 days to unbond by changing the “Source” of Luna.