Thank you for your inquiry about creating dashboards in Splunk Light. We are currently in the process of updating our Splunk Light documentation with information about how to create and customize dashboards, but in the interim, the following information should be helpful to you.
See the “Build dashboards in Splunk Web” information in our Splunk Enterprise documentation. The majority of information applies to Splunk Light and will provide you with steps for creating dashboards. Note there are some Splunk Enterprise dashboard features that are not available in Splunk Light, such as the pivot feature, but most of the information applies to Splunk Light: http://docs.splunk.com/Documentation/Splunk/6.4.1/Viz/CreateandeditdashboardsviatheUI
I hope the above links are helpful to you. If there is something in particular you’d like to see in the Splunk Light documentation about dashboards, please let us know.