To trade options, click Trade>Options on the stock page you are interested in.
You will then see the options contracts available for the stock you are interested in. You can swipe through the dates at the top of the screen in order to choose the expiration date of the contract you would like to purchase.
If you click on the contract, you will be shown the below screen with the essential statistics on the contract. To trade the contract click one of the buttons at the bottom of the screen.
The symbols mentioned above are for demonstration only, and shall not be considered a recommendation or solicitation for the purchase or sale of securities, futures, or other investment products.