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I don't have a mac, but can you find the folder where steam is installed?
If the folders in steam foe mac is the same as steam for windows, so you need to install the mods in "steam\steamapps\cities in motion\addons" or "steam\steamapps\cities in motion\metro"
Remember that I don't have a mac (and never had one) so I am only guessing.
Up until last year Mac and other apple products were very unpopular in Israel, so only very few here own a mac, and iPhone became popular only when iPhone4 was launched here in last October.
 
Thanks giladteller for your reply.

First, I have found a directory called Cities in Motion in Documents, that it has 4 files: control.keys; log_metro.txt; settings.script; state.gs.

Second, I have found a directory called Cities in Motion in Library, Application Support, where this directory has the maps and saves directories with the same 4 files that the first directory.

And finally, I have found a directory called Cities in Motion in Libray, Application Support, Steam, SteamApps, common, where it show the app and I do click the secondary mouse and show the properties and it show the tipic structure of one app in mac.

Any suggestions?

Thanks.
 
It's the third option: Steam\steamapps\common\
Add a directory called "metro" or "addons" (every mod is different, try reading about the mod first), and put the mod in the folder.
 
Thanks giladteller.

On Mac + Steam:
[/Users/[username]/Library/Application Support/Steam/SteamApps/common/cities in motion/Cities In Motion/Contents/MacOS/addons]
(When you are in /Users/[username]/Library/Application Support/Steam/SteamApps/common/cities in motion/ then right-click the app-icon and choose somthing like "show content")
Create the addons-folder if not already there.