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From your screen, you seem to be not using lightbox code. Anyway, to call the lightbox form on a button just append the lightbox class e.g. lightbox-123456678990 to the button class. Example:
<a target="_blank" href="" class="button lightbox-32202591340947">Test</button>
You will be able to find your lightbox class from the lightbox code.
windowTitle:'Clone of Online Booking Form',
<a class="lightbox-32202591342347" style="cursor:pointer;color:blue;text-decoration:underline;">Test</a>
If you have any difficulties applying this solution, let us know here so we can assist you further. Thanks!