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

---

            
                <!-- 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" sizes="57x57" href="favicon-57.png">
                
                <!-- For Old Chrome -->
                <link rel="icon" sizes="32x32" href="favicon-32.png" >
                
                <!-- 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.