Trade shares

You can buy and sell shares of listed companies on the exchange. You place an order at a price per share you choose (a limit order).

Open “Business” → “Exchange”, and choose “Stock”.
Choose a company, set a price per share (in X, whole numbers), and place your order.
If a matching order exists, the trade happens right away (filled).
If not, your order stays on the order book. You can also cancel it later.

The trade price is the price of the order that was placed first.
For a buy order, you deposit the price and the fee in X. For a sell order, you deposit the shares. If you cancel, they come back.
The fee is a % set by the exchange. Both buyers and sellers pay it in X.
If you have unpaid tax, you can't buy. You can have up to 30 orders.
Your own orders are never matched with each other. You can't place an order at a price that would match your own opposite order.
While the company or the exchange is suspended, trading stops (you can still cancel).
Shares in a sell order still receive dividends and the payout when a company closes down.
Only people can trade on the exchange. Companies can't.
You can switch the graph between “Recent · 1 day · 1 week · 1 month · All time”. “Recent” means the last 100 trades.
You can also see share prices, volume, and market cap in “Info” → “Markets”.