You will need to scroll down to the lower half of the page to see the button “change your flight.”
At this point to see how to change your flight you need to scroll down to the lower half of the page. When you are looking at in the screen capture on the right, it seems very obvious how to change your United Airlines flight (it is the “button” right above other options.) But believe me, and others I have spoken to, when you need it the first time in the airport it is difficult to find. Not sure if it is the stress of needing to make the change or the fact that United calls it “Switch to Another Flight.”. Mostly it doesn’t look like something that is clickable.
The other thing that makes it difficult to see where to change the flight, or switch to another flight, is that it doesn’t look like all the other menu items. Your eye is trained to look for menu items and avoid advertisements. United has hidden the “Switch to another flight” menu item in a large bar with a picture that looks more like an ad than a menu item.
Clicking on this, which actually looks like a header for the “Other Options” menu items like change seats, Edit bags, or share flights, brings up the alternative flights list, seen to the left. You will see I have two flight options I can change to with the ability to confirm a seat at no additional charge!1