Adding liquidity is the same user flow as the familiar DEXs exept you only need to supply one token to the pool.
Connect your wallet
Go to the 'Pool' tab and select Add Liquidity
Choose the token you wish to provide liquidity for
Enter the amount of liquidity that you wish to deposit, and click 'supply'. Make sure to look out for the Metamask pop up and sign the transaction.
From the pool tab you can see your active positions