For detailed information on how to use Contact Forms see the WordPress Support page.
When you add a contact form place it at the bottom of the post. You may use one form per post.
To highlight the form, select the shortcode that is generated and offset it using quote button in the format bar. Remember there are other options available besides text fields.
Comment text areas will not display formatting onscreen. Consider leaving a note advising readers.
Note: Comment area will not display formatting onscreen, but it will be visible in the email received. Copy and paste from any text editor.