If you are referring to the new rule_values, then you can just scroll down to the last line in your table in Navicat and hit the + sign to add a line, or the down arrow to start a new line. Then paste in the following using CTRL+V:
Code:
0 Combat:EnableFearPathing true
0 Combat:FleeHPRatio 20
The code that Derision posted is for the source and you can't add that in via Navicat. You have to add it to the source and then recompile it to use it.