1. Embed the QRCode widget on your website to show the QRCode of respective page. The code for embedding is as below

<script language="javascript" src="http://techmag.biz/tools/qrcode/qrcode.js">
</script>

Copy paste the above code into your wordpress theme page where you like the QRCode to appear (side column would be good) and it would display the QRcode like this
You can add style for the class “qrcodeDiv” and “qrcodeImg” if you like to style yourself.