Click the "URL parameter" field.
Using the standards UTM's you have already setup, you can add the parameter you want to use to track a source.
For example, the most common case for email's would be to type "utm_campaign" and click [[enter]].
This will create a source based on whatever comes after [[utm_campaign=]] in the URL, which in the case of email will allow you to track back to specific email campaigns.
So for example if a lead clicks on an email campaign labelled "campaign1" then the URL they land on will be [[www.hyros.com?utm_campaign=campaign1]]
In this case Hyros will generate a source labelled [[@campaign1]]