BIG-IP 10.1.0 Build 3341.0 Final how to edit syslog

Hi, I am new to F5 and I have added the command to push every log messages to my syslog server and I really don't need all those message. All I want is to filter it so i get only Critial, Warnings, and Emergency messages sent to my syslog server. can some one help me on how to configure this on the new version of F5 :BIG-IP 10.1.0 Build 3341.0 Final : thank you Shah