How do I withdraw my accrued yield?

Your yield earned is directly derived from; and attributed to the growth in the exchange rate of hbUSDC. For example: If I my entry point was 1 hbUSDC = 1.0000 USDC and I deposited $100, and now the exchange rate shows 1 hbUSDC = 1.027293 USDC, your yield earned is (100 * 0.027293 = $2.7293). You can realise this accrued yield by withdrawing it from the vault.