WordPress on your own hosting

First get the code from the On your website tab in the dashboard, as Add booking to your website describes.

1. Open the page in the WordPress editor.
2. Add a Custom HTML block where the plan should appear.
3. Paste the code into the block.
4. Press Update and open the page to check.

Paste the code as an administrator. WordPress strips the <script> line from code pasted by an editor or an author, and the plan then never appears.

Is your site on WordPress.com? It has its own guide: WordPress.com.