First about the various Buy/Sell buttons - some brokers require the distinction between Buy to Open and Buy to Close for options. I forgot to reconfigure Questrade to not require that. Just made it have only BUY/SELL buttons for both stocks and options (removed COVER and SHORT for stocks as they are not needed either). Buy to Open and Buy to Close in your version have exactly the same functionality as far as Questrade is concerned.
As for how to place orders, options really work same as stocks. you can right click and select TRADE on the option chain window, or if you have the option in your portfolio, you can do it there, or you can enter the option right on a trade ticket window. If you have a chart open for an option, you can do chart trading, same as with stocks.