The Active User Report will give you a list of the number of submissions submitted by each user for a particular form. This is great for tracking your users' GoCanvas usage.
You can locate the Active User Report by clicking the Reports button in the Home area.
Select a form and a date range for the report:
The View option will give you a web view of your data including the Name, Submitted Count, and Last Submitted dates:
The Export option will download a CSV file with your data that you can open in a program like Excel.