Installation of MangoFp
Check that you have installed the plugin Contact Form 7.
You should also have at least one Contact Form 7 form in use on your WordPress website. If you want to reply to form submissions from MangoFP, your form(s) should contain an email field. MangoFP recognizes the email field automatically when its name is your-name (default for Contact Form 7)
Install and activate MangoFP
In WordPress Admin Area, open MangoFP->Settings. On tab Parameters, you can specify Email field if that is something else than your-email. On the tab Define process steps, you can modify the process to manage the messages.
Open your page with a form on your webpage and submit some data.
In Admin Area, open MangoFP->Contacts. You should see your form submission as a new message.