The system will bring by default some Categories, which you can edit or eliminate and create new ones.
2. By clicking on New, indicate the Name of the Category and click on save.
Later on, you should create Concepts which will be assigned to your Categories of Concepts.
Meaning, a Category is a way of grouping various Concepts under one. For example:
Category: Office
Concept: Light, amongst others.
For more information on how to create Concepts, click here:
http://help.rentlysoft.com/en/articles/5512268-how-to-create-concepts