How to add comment form script manually to template file?

You can use the shortcodes for social commenting as mentioned at the link https://support.heateor.com/social-commenting-shortcode/ in the relevant template file of WordPress.

@heateor

Thank you I read the article, but are there shortcodes other than [TheChamp-GP-Comments] and [TheChamp-FB-Comments]?

Is there a way to create tabbed view?

You need to create the tabbed view yourself.