As a student, you may have created a notebook for homework and then when trying to edit it later you are unable to edit the text or it seems to keep your cursor stuck at the top left of the text. This is because you are typing in a text box on the participant layer when your previous text was on the moderator layer. This happens when you create a notebook when offline as it defaults to the moderator layer. To edit this textbox, you can switch your current layer back to moderator from the Ink Usertype menu in any of the Color/Thickness dropdowns.
For more information about layers, see https://support.dyknow.com/hc/en-us/articles/200264066-For-Students-Show-Layers.