For world builder it's just Ctrl-W in game. as for the downloads they should have come with a readme file to say how to. Guessing that Civ Modders are the same as anyother Modding group.
Moderator Action: Moved to the Creation and Customization forum.
You might want to check the Tutorials subforum for installation guides. There's also a brief description to installing mods here. Essentially, keep the mod's folder system intact and make it a subfolder of the game's /MODS/ directory.
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