Changing initial TV money in the pregame editor

Ok I've googled my heart out trying to answer this, I've done this before years ago but I can't seem to work it out.

I add nation rules and I change the initial tv money but when i save the database nothing changes in the game ( I do select the custom game file when starting a new game)

Can anyone point towards an tutorial on how to do this? I dont want to change anything other then initial tv money