It also enables you to place dynamic QR codes using widget. Dynamic QR codes are easier to scan and enable you to track number of scans, device type, and change URL destination.
How to auto generate QR codes for each post/page
Open plugin settings and choose static QR code (for simple QR codes without analytics). Each page/post will have unique QR code redirecting user which scans it to that page.
If you create free CodeQRCode account and paste ApplicationID, dropdown list will show your dynamic QR codes also.
Checkout how to create QR code contact vcard and place it :
How to place AdSense ad code ?
Just copy & paste AdSense or any other third party Ad code to box and optionally add name. Choose default Ad for each post and page. Go to Dashboard > Appearance > Widgets and Drag n Drop desired code to desired position. Thats it!
Advantages of Dynamic QR codes:
You can read more about dynamic vs static QR codes