Trading options is similar to trading stocks. You can place an order after entering the quantity and price.
Options trading supports Limit Order, Market Order, Stop Limit Order, Stop Order, Limit if Touched Order, Market if Touched Order, Trailing Stop Limit Order, Trailing Stop Order.
As a contract, an option is traded in units of one contract. Typically, 1 option contract is equal to 100 shares (Corporate actions may result in 1 option not being equal to 100 shares).
For example, there is an option contract AAPL 170314 140.00C. Its quoted price is $2 means the price (premium) of this contract is $2 * 100 = $200. Upon exercise, you will receive 100 shares of AAPL.
Trading hours for the options are 9:30-16:00 EST.
Note: Options do not support pre- and post-market trading.