...
Events: The events are one of the most important categories as they enable you to search records by what module has been affected. E.g. Contacts, Matters, Trust etc
Each Event will have specific actions within that module that you can search by as well. E.g. Contact Created, Contact Edited, All Contact Records etc
There is also a setting at the top allowing you to search All Events. 
...
Users: This allows you to search by specific users or all users. This category is split up into Active and Inactive Users.
...
Searching:
Once you have used the above categories to tailor your audit search, you can press the Search or Download buttons at the end of the page.
Search: The records will appear at the bottom of the page underneath the search categories.
Download: This will download and excel spreadsheet of your results
We recommend that you Search first to ensure your results are as expected and then download from there.
...
Changes can be made to the search at any time after which you again press Search or Download. If you would like to create a completely new search, select the Reset button to remove all your preferences.
...