Go to the "Liquidity Pool" page and select the trading pair for which you want to provide liquidity (e.g., BTC/BUSD).
Deposit the two tokens in the required ratio, enter the amounts, and confirm.
Confirm the transaction details, enter your password, and sign (OB wallet users will have a signing step). Wait for on-chain confirmation.
Click "My Liquidity" at the top of the page to select your pool. You will earn a proportional share of the trading fees generated by this pair and can add or remove liquidity at any time