How do I annotate on OrbitNote?

Excuse me, could you please elaborate on the process of annotating on OrbitNote? I'm curious to know the steps I should follow in order to effectively mark up or add comments to my notes using this platform. Specifically, are there any tools or features that OrbitNote offers to facilitate the annotation process? Additionally, is there a way to collaborate with others and share annotations, perhaps for group study or project work? Thank you in advance for your guidance.