There are two main steps required to complete an Isora GRC org unit assessment:
Users: How to Categorize Hosts With Express View
Users: What Are Unit Questions?
For ordinary users (non superusers) who don't have any special roles assigned, when you initially log in, you will see an Express View of Isora GRC. In other words, you are automatically be taken to the assessment module to be presented with a list of assets. For each asset, you can click the "answer" button to start a wizard allowing you to perform a host categorization on the asset.
For more information see: Express View