How to stop popup on loading page, open only when click on button?

You want the popup loading and display only on click on button. Achieve this as follows:

Use a href in button like this: href=”?give-message#spu-29″. Click on this will reload current page with query string ‘give-message’ and will display a popup of id ‘spu-29’.

Your popup setting should follow:
1. Popup display rule: query string is equal to ‘give-message’
2. Trigger action: manual triggering
3. cookie: blank or 0
4. Other setting as your need

or Somethin like this:

<a href="#" class="spu-open-29">CLICK HERE</a>