In order for Polkadot Tiger to see your Wordpress website as available, you need to connect the site to the Google Webmaster Tools using your Google account.
Visit the Google Webmaster Tools website (just type it into the search bar). Log in here with the Google account you are using for Polkadot Tiger. Select your property type (usually URL prefix is the recommended option).
Next, you need to verify your ownership over the website by adding a specific meta tag to the HTML of your site.
For an in-depth summary on how to connect your Wordpress site to the Google Webmaster Tools, visit this website.