Transmuting for the first time requires two transactions: APPROVE and STAKE. Among them, APPROVE transaction is only needed the first time. After the APPROVE transaction is confirmed, you can STAKE your nUSD.
2. If there is a Transmutable DAI quota, you can click on TRANSMUTE & CLAIM totransmute your staked nUSD into DAI. Or you can click on TRANSMUTE & EXIT totransmute your staked nUSD into DAI and withdraw remaining staked nUSD.