Help, I'm lost with javascript and onclick actions!

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Javascript

HTML

WordPress

Hi there,

I'm currently building a WordPress website for a company which takes bookings for appointments. To cut a long story short they use a service called 'Timely' to manage their appointments. Timely make a plugin for WordPress so you can integrate the booking process right into a website in the form of a button which once pressed loads a lightbox style element to take people through the booking process.

What I'm trying to do is to bypass this button as I don't like its appearance and they've made it impossible to change with CSS.

I should mention that the website is built with visual composer which takes care of the page layouts and elements. I've created a button with the correct styling, however, I'd now like to use this button to launch the Timely booking process.

I've never really had much experience with Javascript before but somehow I think I need to get this newly created button to run the same script that the timely button runs can anyone help?

This is a page with both buttons on for example: View Page

The top button is the Timely generated one and the below that is the styled button visual composer creates which is what I want. I want that button to perform the same action as the timely button does once clicked.

What I have tried:

I've tried onclick actions however I wasn't entirely sure if I was doing it right.