Google analytics not working

Hi,

I like to add google analytics to my site but can’t find where to put my trackingcode. I have googled and I normally have to add it in the header but I can’t find where.
Also I am using the fashion stylist theme some people are saying that it uses the blossom fashion theme but also there I can’t seem to find where to put it.

I installed the plugin headers and footers and added the tracking code in the header section. After doing that my wordfense plugin complained and I marked it as a false/positive and it stopped complaining so I guess that it went well but two days later I don”t get any statistics in my google analytices dashboard.

I hope that someone can help me with this?
Thanks!