Follow the official Wordpress plugin installation instruction. You can search the plugin as Feedback Farm.
There's two ways of configuring the plugin. You can either add a "Give Feedback" button to your wordpress site menu or you can add the widget to any HTML element of your website.
Go to the Wordpress admin panel and click on the Feedback Farm plugin configuration page.
Complete the "Project Id" field with your project id from feedback.farm.
Now in your menu, a "Give Feedback" button will be added.
Supposing that you have a button on your website looking like this
You want to add those 2 attributes to the button to make it work with the Feedback Farm widget.
<button data-feedback-farm data-feedback-farm-project-id="project_id">
Now when you click the button, you will see the widget.