To use the favicons insert into your head section some of these tags accordly to your needs.

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<!-- For old IEs -->
<link rel="shortcut icon" href="favicon.ico" />

<!-- For new browsers - multisize ico  -->
<link rel="icon" type="image/x-icon" sizes="16x16 32x32" href="favicon.ico">

<!-- For iPad with high-resolution Retina display running iOS ≥ 7: -->
<link rel="apple-touch-icon" sizes="152x152" href="favicon-152-precomposed.png">

<!-- For iPad with high-resolution Retina display running iOS ≤ 6: -->
<link rel="apple-touch-icon" sizes="144x144" href="favicon-144-precomposed.png">

<!-- For iPhone with high-resolution Retina display running iOS ≥ 7: -->
<link rel="apple-touch-icon" sizes="120x120" href="favicon-120-precomposed.png">

<!-- For iPhone with high-resolution Retina display running iOS ≤ 6: -->
<link rel="apple-touch-icon" sizes="114x114" href="favicon-114-precomposed.png">

<!-- For iPhone 6+ -->
<link rel="apple-touch-icon" sizes="180x180" href="favicon-180-precomposed.png">

<!-- For first- and second-generation iPad: -->
<link rel="apple-touch-icon" sizes="72x72" href="favicon-72-precomposed.png">

<!-- For non-Retina iPhone, iPod Touch, and Android 2.1+ devices: -->
<link rel="apple-touch-icon" href="favicon-57.png">

<!-- For Old Chrome -->
<link rel="icon" href="favicon-32.png" sizes="32x32">

<!-- For IE10 Metro -->
<meta name="msapplication-TileColor" content="#FFFFFF">
<meta name="msapplication-TileImage" content="favicon-144.png">
<meta name="theme-color" content="#ffffff">

<!-- Chrome for Android -->
<link rel="manifest" href="manifest.json">
<link rel="icon" sizes="192x192" href="favicon-192.png">

            
            

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For more informations about favicons consult The Favicon Cheat Sheet by Audrey Roy.