How can I download a Sims 3 mod on my Mac?

I'm terrible with computers, so I have no idea whatsoever how to download a mod for the sims 3 on my Mac. I know you have to have a mod file but I don't know how to get one, or anything else for that matter.
The more details would be the better, and if you could somehow include pictures that would be great! Thanks!

Icelynn Marie2014-07-20T11:55:15Z

This was the only thing I could find on Mods for Macs. I'm not sure if it'll help much, but at least it's something.

/question/index?qid=20120524155518AAlbzNf

Also, just create the Mods folder under My Document>Electronic Arts>Sims 3
Make sure you spell it JUST LIKE THAT. Once you've done that, go inside the Mods folder and make another folder called Packages

You can find the Nraas mods here
http://nraas.wikispaces.com/