You can also perform the initial set up of your QuickRemote from
the Notifications panel. Swipe the Status Bar downward, tap the QuickRemote icon (in the Quick Settings bar), if necessary, tap ADD REMOTE in the dialog box, then continue set up as
necessary.
After initial setup, to set up additional devices from the Notifications
panel, tap the Full-screen icon (at the lower-right corner of
the remote display), then tap the Add icon
(at the top right of the QuickRemote
screen).