You can upload a customized icon for your website to display on the top of the internet browser - also called a favicon - from the Configure Site > Internet Browser Icon menu on your website Admin Panel. 

Just upload your Icon File on the page, and the software will automatically code your webpages accordingly.

Your icon file needs to be a .ico file format.  You should make it 16x16 px.  Create & save the file accordingly on your favorite graphics software, such as Photoshop or Gimp.  If your version of the graphics software does not allow you to save the file as a .ico file, here's one way to do it:

1) Create the image file on Photoshop, or a similar graphics software, and save the file as a jpg or gif image.

2) Download IrfanView on CNet: http://download.cnet.com/IrfanView/3000-2192_4-10021962.html?part=dl-IrfanView&subj=dl&tag=button

3) After installing IrfanView to your computer, open and use it to convert your icon file - Open your file and then just save it as a .ico file.

4) Now upload your .ico file on the Configure Site > Internet Browser Icon page on your website Admin Panel - the software will code your webpages accordingly.