cancelling for just 1 on 3 person itinerary

So I am not so familiar with having to cancel on Alaska: 3-person itinerary, using the website, if I click on "cancel this flight" am I going to get options to choose 1 or more person or does clicking that first cancel option go straight to wiping all 3 out? (I don't want to do that!) Hesitant to click it to find out.