After you deposit liquidity into the pools, you can go to the farm page and deposit your LP tokens to farm yields.
Click a farm where you have the LP tokens.
Here you can see how many LP tokens you own. You can either click MAX to stake the maximum amount of LP tokens, or enter the desired amount of LP tokens. Then click Stake.
Approve the transaction in your wallet app.
After you have staked into the farm, you can see your position here. If you want to unstake your position, you can enter the desired amount of LP down below and click unstake.
By clicking Claim, you will claim all your rewards from farming.