Your eqclient.ini should be in the root EverQuest directory, which you can find by right-clicking on the icon you use to play Everquest, choosing "Properties", and then looking at the "Target". It should say "*some stuff*eqgame.xe"; the "*some stuff*" is the path to your root EQ folder ...
... but you don't need it. Typing:
in the game will turn logging on (or off it's already on).