You need to open orders >conditional trading >new trigger to get the second image.
Then you just fill in what you need. I'd recommend the circled Fee option as no point in paying upfront when it might not get hit.
The trigger price is where your order gets triggered and your "at limit" price is your minimum sell price. It's wise to have this lower than the trigger in case the trigger price gets jumped. The "optional" sections aren't really necessary.
***Bell Direct have free conditional orders by the way.
