Hi Sherman, Thank you for your interest in ExtraHop. Configuration instructions and other help is available in our customer forum at https://forum.extrahop.com. You will be assigned a forum login after you are approved for the ExtraHop free trial download.
If you're a current ExtraHop customer, you can email firstname.lastname@example.org for your login. If not, you can get started with the free ExtraHop Discovery Edition. Once you download it, the login to the forum will be created for you automatically: http://www.extrahop.com/products/platforms/extrahop-discovery-edition/
The ExtraHop Splunk App may not be what you are most interested in. If what you want is to build dashboards or reports on ExtraHop wire data, you need to configure Splunk as your Syslog SIEM entry in ExtraHop. You can then build triggers to send custom fields and values to Splunk.
Check out this article on ExtraHop Forum
ExtraHop To Splunk Article