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Add the script

Option A (recommended): Use a plugin like “Insert Headers and Footers” (by WPCode) to add the script tag to your site footer. This avoids editing theme files and survives theme updates. Option B: Edit your theme’s footer.php and paste the script tag before </body>.

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Add the button

In the WordPress block editor, add a Custom HTML block wherever you want the button and paste the button code. Alternatively, add data-fmv-open-widget to an existing button in your page template or theme.
Page builders: If you’re using Elementor, Divi, or WPBakery, add an HTML/Code widget and paste the button code there.