How to send log file by using Universal Forwarder

Hello, The following process variable logs are created in my system. ------------------------------------------------------- Time | Target | Variable | Status 00:00:00 1 99 On-line 00:00:01 2 89 On-line ...... 01:01:03 10 76 Off-line ------------------------------------------------------- I want to send all process variable logs to Splunk's SIEM by using Universal Forwarder. However, I don't know how to set-up its configuration to send log file. Could you please tell me how I can set-up it? Thanks, Kevin