Created a custom mod, it's shows up in the mod panel, I can enable it, but it's not changing anything. What are the steps I need to take?

[BruceLover69]

I created a custom mod using a .lua file, it's supposed to change Robert the Bruce's original useless ability into one where all his cities turn ecstatic for 10 turns. In addition to this he gets +1 amenity to all his cities settled next to lakes. The .lua file works because the print I put in the file shows up in the lua.log. That's about all I know. The gameplay doesn't change and the charachter selection screen hasn't changed as well. What steps do I need to take to make sure I can get this piece of horsehockey to work?