Step 5 : Change in CSS
If you need to configure the CSS style of WP-PageNavi, you can copy the pagenavi-css.css file from the plugin directory to your theme's directory and make your modifications there. This way, you won't lose your changes when you update the plugin.
Alternatively, you can uncheck the "Use pagenavi.css?" option from the settings page and add the styles to your theme's style.css file directly.
That’s it once completed the installation and configuration part go to your WordPress site and check how it looks and works.