On each chain page or in the Staking tab, you can see how much you have staked with each validator. Click a validator you’d like to unstake from, then the staking modal will open with that chain and validator already selected.
Hit Unstake to proceed.
Then you will see a short notice about the unstaking period along with a field to enter the amount you want to unstake. Read the instruction, enter the amount, scroll down, and click Unstake to confirm. Approve the transaction in Keplr Extension.
After unstaking, check it on each chain page or manage all your staking/unstaking assets at a glance in the Dashboard’s Staking tab. You can also see an estimate of when the unbonding period will be completed.
Some chains let you cancel unstaking mid-way. Check if your chain supports it before you stake or unstake.