Make sure download webfont icon pack (zip) file from home page after download you will get all files this files you need to include in your webpage. First you need to include “fontice-iconsfont.min.css” file which available on css folder in downloaded pack. refer below css include method.
After include css file you need to put all fonts (EOT, SVG, TTF, WOFF) which available on fonts folder in download pack. Please note this fonts should match in fontice css path file. Now you can use all icon in html file or css file please check below reference how to use in html and css.
Apple below HTML code to use Lock icon in your web page
Apply below CSS code to use Lock icon in background like image
Done! Now you can use and customize Lock icon as per your requirement like change color, size apply css effects or animation.