You need to read the documentation on the Apps that you downloaded for Cisco. I would recommend using the Splunk provided apps and not the "homegrown" app above. When you have these apps installed you need to make sure your sourcetypes line up with the ones specified in the application. Also make sure your index is correct with the dashboard search. To check this click the magnifying glass beside the dashboard and see what it's searching on.
Source types for the Splunk Add-on for Cisco ASA
Source type
cisco:asa The system logs of Cisco ASA record user authentication, user session, VPN and intrusion messages. Authentication, Change Analysis, Network Sessions, Network Traffic, Malware
cisco:fwsm The system logs of Cisco FWSM record user authentication, user session, and firewall messages. Authentication, Network Sessions, Network Traffic
cisco:pix The system logs of Cisco PIX record user authentication, user session, and intrusion messages. Authentication,Network Sessions, Network Traffic
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