When you first create a process model using Barium Live BPMN Modeler 2.0 a Quick Guide will appear. The guide helps you trough the basics of the modelers functions and settings.
You can choose to "Don't show this again" if you don't want it to open every time you open the modeler, but if you would like to show it again after, use the question mark in the upper right corner of the modeler to open the quick guide again.
Looking for more guidance? Read these articles:
Or check out the remaining articles in the category Using the modeling tool - BPMN 2.0