Read the description of the addon.

There is a hook which you can change the value of the damage or you can simply go into the lua files and change the damage, i would advise going with the hook

and he means check out this page

https://github.com/robotboy655/robotboy655.github.io/blob/master/lightsabers.md

and here is the hook

hook.Add( "CanLightsaberDamageEntity", "my_unqiue_hook_name_here", function( victim, lightsaber, trace )
return 50 -- Makes the damage twice as high for the weapon
end )