You will see a list of accounts. The ones that have a state "unhealthy" are usually liquidable.
Click inspect and you should see a more detailed screen.
Note liquidating is disabled if account liquidity > 1 it will say so at the top of the screen
You might see a bunch of check marks, this is because for the liquidation to work you must first approve the underlying token (DAI) for example to interact with the cDAI smart contract.
Before you can utilize these tokens, to repay or retrieve they must be enabled.
Click on the checkmark and approve the transaction. This will only cost gas, nothing else. It will say 'approval' at the top of the transaction (if you're using metamask)
Once it's approved the checkmark will turn into a circle which can be selected
Once you have selected a asset to repay and an asset to retrieve you can adjust the slider at the bottom to change the amount you're paying back
Once you've selected your amount click the repay button
A transaction will pop up, for this transaction to succeed you will need that much underlying in the same account as the account you're sending the transaction from.
Once the transaction goes through if it's success you will get the amount of cToken sent to your address, you can check your amounts using the compound.finance site.
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent