Do not send straight from an identity-checked exchange to the market, because the exchange record ties your name to the deposit. Route through a fresh wallet you control first, such as Sparrow or Electrum, or better still swap into Monero.
Open the order, copy the deposit address Awazon shows for it, send exactly the amount, and pick a fee that confirms within a reasonable window. Overpaying wastes money and underpaying gets the transaction stuck. The balance credits once the confirmations land.
Keep the on-market balance sized to the order, not parked between orders.