We need to install the Caldera Forms plugin before executing this recipe. This plugin was installed in Chapter 4, Publishing Site Content with the Gutenberg Editor. If you haven't installed it, follow these steps to do so:

1. Log in to the WordPress Dashboard as an administrator.
2. Click the Plugins | Add New button.
3. Search for Caldera Forms in the Search plugins field.

4. Once the plugin is listed, click the Install Now button.
5. Click the Activate button to activate the plugin.

Now, you are ready to start this recipe.