After installing this plugin first thing you have to do is, go to this plugin settings page > form settings. All the Contact Form 7 forms will show up here. You have to set a form that will be shown in the quote popup.
If you want to use this quote button plugin with WooCommerce you can check the WooCommerce settings. Here you will find all the required options for that.
The quote button text, size and color can be changed from the button settings tab.
From the popup settings section, you can set the width of the popup. Also, there is an option for disabling the form styling.