Timer interface?

Sorry to ask this – we’ve upgraded from 4.4.4 to 5.0.1 on Ubuntu. I’ve had a request for a Timer and I see a blog post about 4.4.4 introducing one. For the life of me I can’t find where to activate it for a ticket. I don’t see any place it would activate so I’m assuming I need to turn it on in settings.

Thank you for any help.