United Airlines: How do I book or change my seat?: In reviewing itinerary, noticed I missed booking seat. Can I do that now?

In reviewing itinerary, noticed I missed booking seat. Can I do that now?
ETA
29 mins
NEW
Let us save you the time!
If you want to book your seating you can do it through two different methods, either on the web or over the phone - Step 1: Go on the US Airways account via https://www.united.com/web/en-US/Default.aspx Step 2: Select the flight you would like to edit seats with then click “select” Step 3: Continue back to the seat assignment page then click the “View/Change Seat” under the listed passengers, then proceed to change your desired seat Step 4: Continue on after you select your seat by clicking “complete seat reassignment” or you can call here - https://gethuman.com/phone-number/United-Airlines I hope this helps!
No time? Let us do it.Hand your issue over to us- we'll wait on hold, do what it takes to resolve it, and report back- or give you a refund.
More...