[ASK] How to combined CF 7 with exit splash pop up script

Hi, I’m using CF 7 and exit splash pop up script. The problem is when I click submit button on the CF 7, the form won’t be submitted and there will be pop up message because of the exit splash.

I want to combine them to be worked together. I have googled and find the single script to be put as the exception that we don’t want the exit splash to be worked. Here’s the script: onclick=”exit=false”
So, for example, I can disable a link that I want if there’s a user click on and there’s no pop up.
Anchor text

The question is, how and where can I put this script: onclick=”exit=false” on submit button of CF 7? I have tweaked the plugin folder, but I only got errors.

Please someone help me. I really appreciate it. Thanks a lot =)

https://www.ads-software.com/plugins/contact-form-7/