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.