To Convert your small balance (dust) into BNB, first, select ‘My Exchange Accounts’ and click on the Convert button.
You can convert balances with a valuation below 0.001 BTC to BNB once every 24 hours.
Select all or the specific coins you would like to convert. This will reveal the total converted into BNB
Next, click the Convert button. These coins will now be converted into BNB.