2. How to trade (Market & Limit)
Upon clicking "Trade" in the top right hand corner, you'll be launched to the trade interface. From this page you'll be able to see all markets, all current positions, pending orders, and all past trades.

At the top of the page, you can select the market you'd wish to trade from a drop-down menu. Once selected, all the relevant information will update.

After you've chosen the market, you'll need to select whether you're going long, short, or swapping. Long and Short refer to Leveraged Trading. Alternatively, swapping refers to swapping one underlying asset for another underlying asset.
In the following example, the user has chosen to go long ETH, at a market order, with $10 margin, at 5x leverage. N/B that this is a market order, as opposed to a limit order.
In order to execute the order, the following approvals will have to be executed via a wallet prompt (they are: Enable Leverage, then Approve USD (in this example it's PPUSD), and then Long ETH).

Once this is complete, the order should execute, and will now sit under the position tab:

You can now adjust your existing position by clicking "Edit" at the bottom-right side of the screen. Editing the position keeps the position size (notional value) constant, while changing the margin amount.
By depositing margin, you will reduce leverage.
By withdrawing margin, you will increase leverage.

You can close a position partially or entirely by clicking on the "Close" button.

For long positions, profits are paid in the asset you are longing, e.g. if you long ETH you would get your profits as ETH. For short positions, the user can select which stablecoin the profits are paid out in by changing the selection for "Profits In".
Note that arbiscan may not always show ETH transfers so when you close long positions on Arbitrum and receive ETH the transaction might not show the transfer but your ETH balance would have increased.