Make contact form 7 in a row ?

RE: I would like to make contact form 7 to stay just in one row on the place where it’s written “Click here for Contact”…

This is a theme issue – contact your theme provider.

RE: How do I select between contact forms when I am writting css? Somehow by it’s ID?

See ?Styling a Specific Contact Form 7 Form

You can now also add an id and class to a form by adding the html_id and html_class attributes into a [contact-form-7] shortcode.

Example: [contact-form-7 id="1234" title="Contact form 1" html_id="contact-form-1234" html_class="form contact-form"]

See https://contactform7.com/faq/can-i-add-id-and-class-attributes-to-a-form-element/

This is a good way of styling multiple CF7 forms.