Popup - the button "show again" is needed

Hi, is there any way how to add "show again" button somewhere? It's a custom build theme, so I can add in code (and I would like to)? I need it's to show the pop-up when I click on it and display the pop-up whenever I am on the page.
PopUp will show itself automatically on the main page only, to be re-shown on all the pages across the web. Thanks in advance