How can I set a favicon?

Sorry if question was already asked, but I don't find certain answer for that question.

I seen that I can set a variable, but how?

Is there any easy way to set favicon without editing themes and code. Thanks!

dmitriy-8gears You can use the Image Favicon field in the shared settings.

mad OK, but I'm using Revitron theme and I haven't this field. Am I should write to theme developers?