How to create a popup window for Blogger
- Login to your blogger account
- Go to Dashboard >> layout and click “add a gadget” from sidebar or footer
- Open HTML/JavaScript gadget
- Add the following script in HTML/JavaScript content area and click save

Note:
- Make sure to change the http://techpoison.in URL
- Customize the width and height of the popup window like you wish
Now a popup window opens pointing to that page when users click somewhere on your blog.