if you double click on the contract your looking to buy and sell that will bring up the chart for the option your interested in and also load it into the main montage. From there you can use the same hot keys you use for stocks to buy and sell the contract (buy on the ask + 5 cents, sell on the bid -5 cents etc). I've put in a request with Das to add hot buttons directly to the options chain the same way you can the montage but who knows if and when that will be released. if you want to keep things simple though you can just single click on the option contract your interested in trading and use the default "buy to open" sell to close" buttons on the option chain with market orders if your just looking to day trade calls and puts. i use the smrtm route with IB for this and havent had any issues so far getting in and out near the last price. I do stick to highly liquid options like $SPY and $TSLA though. wouldn't recommend using that approach with a random stock in play.