iOS Build a Simple iPhone App with Swift Improving Our User Interface Finishing Up Our Layout

Niilo Pirttijärvi
PRO
Niilo Pirttijärvi
Pro Student 2,354 Points

Xcode does not allow me to press the update constraints constants.

When I'm trying to update the constraints my Xcode 9.1 doesn't allow me to update them. The button is sort of grey as in not a valid option. So how should I update the constraints constants?