[Plugin: Fast Secure Contact Form] Possible to have a "are you sure" check?

Hi.
I’ve used this plugin a few times and everything has worked smooth..
Now I’m wondering, is it possible to add a confirmation-check which will appear when the user clicks the send-button.
something like “Are you sure?” in a popup or whatever and just have them click another button before the email gets sent.

Thanks
/Jonathan

https://www.ads-software.com/extend/plugins/si-contact-form/