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A market trade goes as soon as it can fill at the price available. It is the default way to trade in Dawn, and the fastest.
Tapping an amount sends the trade. There is no separate confirm step on a normal buy or sell. Check the coin, the chain and the wallet before your finger is over a button.

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Before you tap

Four things decide what actually happens:

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Buy a coin

1

Open the coin

Paste its contract address. Make sure the panel is on Buy.
2

Choose a size

Tap a dollar button — $1 · $5 · $10 · $25 · $50 by default — or $x to type any amount.The minimum is $1. Some bridged routes ask for more.
3

Watch the card

Dawn quotes, signs and submits. One card updates itself in place: Buying → submitted → filled.The finished card shows what you spent and what you received. The panel behind it updates with your new holding.

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Buying without opening the panel

With Auto Buy on, pasting a contract address buys a fixed amount immediately, and the panel follows the trade card. It is off by default, and it spends money on a paste — turn it on deliberately.

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Sell a coin

1

Open your holding

Send /portfolio and tap the coin, or paste its address again.
2

Switch to Sell

The sell buttons are shares of what you hold, not dollar amounts — 10% · 25% · 50% · 75% · 100% by default.
3

Choose a share

Tap one, or x% to type your own. 100% sells the position out completely.
4

Read the result

The card shows the USDC you received. It goes back onto your balance, ready to spend again.

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Reading the result card

A failed trade is not a lost trade. When a fill would land outside your slippage, Dawn refuses it and returns the USDC rather than filling you at a worse price.

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Why a trade gets refused

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Selling everything at once

There is no bulk exit across coins. Sell each position from its own panel with the 100% button. If you want an exit that does not need you watching, set a stop-loss or take-profit instead.