To add a favicon to a wordpress site where you use AffiloTheme, you will need to do these steps:
Log in to your Wordpress dashboard. If you are an Affilojetpack member, you can login to your Wordpress site by going to the Affilojetpack members area and clicking on the name of your domain on the right sidebar
Click Header Style on the AffiloTheme menu.
On the Other Settings section, click Upload and then browse your favicon file from your computer. You may use a regular image as your favicon or just select from one of the images on your Media Library.
Once you have uploaded or selected your favicon, click Save Settings.