Navigate to https://farm.liquidus.finance/
Connect your wallet
If you have not approved a pool before, you will see Approve button. Click on that button to approve the pool.
Click on the Get Liq-BUSD LP link on the pool or this one
Connect your wallet in the Apeswap website (linked from previous step)
Then add liquidity. For example, if you want to add 100 LIQ, then you need to have the BUSD equivalent of 100 LIQ. You can choose value on the one field, the other field will be automatically calculated
Once the liquidity has been added, head back to the previous farm tab of Liquidus
Now use the + sign to stake your liquidity into the pool, approve the transaction and confirm that the pool now shows your contribution. The Liquidity Pool token is different from LIQ/BNB token. You may want to import that token into your wallet.
Watch out and see the earning !! Harvest often, re-stake on the same pool or a different pool for compounding.