First make sure you have Elementor and Contact Form 7 plugins installed.
When all plugins are installed go to the contact tab.
You will find a pre-made contact form in the Contact Form 7 plugin page. You can use the pre-made one or create a new contact form.
Do not change the coding.
Then go to the page tab and create a blank page. Set the name of your page and start to edit with Elementor.
In the Elementor View widget area, drag and drop the Contact Form 7 widget to your preferred section.
From the contact form drop down menu, choose one of the forms you created. And you will see in the Elementor View your basic form.