The Quill timeline recently had a major Overhaul with the release of Anim 2.0. This video will show you the new timeline and teach you how to navigate it.
Left Controller Analog stick UP - Create new blank frame
Left Controller Analog stick DOWN - Hold frame
Left Controller TRIGGER + Analog stick DOWN - Delete Frames
Left Controller Analog PRESS - Playback animation
Left Controller Trigger + Analog Stick Left - Return to first frame of timeline