From your Blogger dashboard, click on the “multiple page” drop-down and select “Layout” as seen in the following image:
Click on “Add a Gadget” directly under the header.
In the new window that pops up, scroll down until you see “HTML/JavaScript” and add it to your Blogger account.
Title the gadget “NRWebReader”, and paste your WebReader script into the content box. Finally, save your changes.
Click on “Save Arrangement” in the upper right hand corner and you’re done!
Your WebReader should now be embedded into your Blogger. If it doesn't show up, please contact us.
You can also check out this third party tutorial:
Installing the JavaScript on Blogger