1. go to blogger→theme→Edit HTML
2.Press Ctrl+F and search <head>
3.Paste the the code below under <head>
<script type="text/javascript">
//below javascript is used for Disabling right-click on HTML page
document.oncontextmenu=new Function("return false");//Disabling right-click
</script>
//below javascript is used for Disabling right-click on HTML page
document.oncontextmenu=new Function("return false");//Disabling right-click
</script>
4.click save theme.
