Go to https://pad.lz.finance/. Connect your BEP-20 wallet to LZ Pad.
Once your wallet is connected, you will see your $LZ balance as below.
Click Join Now and enter the amount of $LZ you want to lock.
Click Lock LZ and confirm the transaction in your wallet.
You'll receive a notification like this after you have successfully locked your $LZ:
Whenever you want to review the status of your locked $LZ, click on your wallet address on the upper right corner of the page.