Here are the steps to add a countdown timer to a WordPress site:
1. Install and activate a countdown timer plugin such as WPForms, Countdown Timer Ultimate, or T(-) Countdown.
1. Once the plugin is installed, create a new countdown timer by going to Plugins > Countdown Timer Ultimate > Add New Timer.
1. Configure the settings for your timer, including the end date and time, the display format, and any custom messages or labels.
1. Add the timer to your WordPress site by using a shortcode or widget. To use a shortcode, copy the shortcode provided by the plugin and paste it into the page or post where you want the countdown timer to appear. To use a widget, go to Appearance > Widgets and drag the countdown timer widget into the desired widget area.
1. Save the changes and view your website to see the countdown timer in action.