Hi! I am trying to add a custom favicon to ghost thru the theme Marquis. Does anyone know how to do this?
I have found where the icon is in the assets folder (see image)

Is it just a matter of changing out this ico file via the server and refreshing the theme?
Sorry I am a total newb.
this guide should still be up to date 
Thanks vikaspotluri123 but for some reason on my blog setting page the publication icon does now show up.
I doesn’t show up because it has a white background and you can’t see it, because it hasn’t been uploaded or because your custom css it’s hiding it? Check if around there you have a delete button.
The only thing you have to do is upload it here:

and make sure you follow the format they tell you.