How to embed my form in WordPress using feedback button method?

You will need to embed your form following the steps on this guide: Creating-a-Feedback-Button

But there is some JavaScript code needed to get the feedback button working properly, in WordPress you will need to use either a plugin or add the feedback code in the source code if your website, if you decide to use a plugin here is one that may be helpful: https://wordpress.org/plugins/custom-css-js/ 

Hope this helps.