Open the Planners tab on the home screen. Some planners are free and some need Premium.
Planner tabs and links work. By default, tap a link with your finger, or double-tap it with your pen. Change this in a note under Menu › Gestures: Tap at PDF Link with finger, and Open PDF Links with Ink Tool (Off, Tap or Double Tap).
You can add your own links too, with Insert › Insert Link to a Page or Insert Link to a Website.