In order to install WebReader on your WordPress website, you will need to install a third-party plugin that supports embedding scripts.
On your WordPress website, go to the website's dashboard.
In the left panel, Plugins > Add New.
On the Add New page, search for the plugin "Insert Headers and Footers."
Once the "Insert Headers and Footers" plugin is installed, in the left panel, click "Settings" which will expand into a list.
Look for "Insert Headers and Footers" in the list.
Obtain your WebReader Script. Click the "Get Code" button for the widget you want to embed to retrieve the script code.
Copy and paste WebReader script code into the section "Scripts in Footer."
Click Save, and your WebReader is installed for your WordPress site! If the widget doesn't show, please contact us.
There are third party tutorials you can follow too:
Add Custom JavaScript into your WordPress Site
Or tutorials from Youtube (Method 1: 0:00 - 2:00):
How to add JavaScript in the head/body tag of your WordPress site