Mod Civilizations Don't Appear

Hey there.
I bought Vanilla Civ 5 two days ago (missed the 2K sale by that much!) and I wanted to try some mods so I downloaded Codefreak's Fire Emblem civilizations (for Vanilla). I enabled them in the Mods tab in-game, but they still won't appear in the Set-Up Game menu.
What have I done wrong?

At a guess you clicked "Back" at the Mods menu after the Mod Browser screen instead of "Single Player" - see step 9 here

Yup, it was that. Thanks!