The contact form on the contact page of the demo site was created with the Contact Form 7 plugin. You can install it by going to Plugins > Add New and then doing a search for “Contact Form 7”. It should be one of the first results you see. Once you’ve found it click the “Install Now” button and follow the prompts to activate the plugin.
You’ll now have a new option on the WordPress left menu called “Contact”. You can create a new contact form by clicking “Add New”. The form layout will be prepopulated with some fields which you can edit as you like. It’s pretty straightforward to use. Once you’ve created your form click “Save”.
Once you’ve saved it you’ll see something called a shortcode appear at the top of the page that will look something like this:
[contact-form-7 id="7" title="Contact form"]
Copy it and create a new page under Pages > Add New. Give the page a title and paste that shortcode into the content area of the page. Once it’s published you now have a contact page!