on page for installation instruction https://premium.wpmudev.org/project/comment-form-text/installation/
on point 6
If you are using any theme other than Farms '100 big ones' theme pack you need to add the following php code where you want the text to appear in a theme and then upload the amended file to your site:
There is no php code displayed below the comment in text format. what is displayed is contained in the image.
it would be nice to have code in text form, so that users can copy that code easily.