Liquidity withdrawals are done directly from Uniswap, by following the steps below:
Make sure to have your web3 connected to tag along.
Go to the Uniswap page and select Pool
The interface will display all your positions in Liquidity Pool
Select which position you wish to withdraw from
Click Remove
The first time you are withdrawing from a pool you will be requested to Approve the transaction via your web3 wallet.