Try editing `category.php` – or `category-news.php` if you have it – your CSS seems to indicate you've created a "news" category, but you'll hopefully know which files you've edited - and adding:

    $withcomments = 1;
    
    // If comments are open or we have at least one comment, load up the comment template.
    if ( comments_open() || get_comments_number() ) {
        comments_template();
    }

between `get_template_part('content', get_post_format() );` and the `endwhile` (in the bit where WordPress loops through each post.)

This will add a comments form after every post on a category page (if you have loads of posts, especially short ones, you may find it much too cluttered, though.)

As for the **date**, the Twenty Fourteen theme has a function called `twentyfourteen_posted_on()` (it's in the `template-tags.php` file) - it prints the date and the author.

As you'll see if you inspect how it works, you can add:

`echo esc_html( get_the_date() );`

to print the date by itself, and [get_the_date()](https://developer.wordpress.org/reference/functions/get_the_date/) takes a parameter that lets you customise how the date (and/or time) is displayed using the standard [PHP date format](http://php.net/manual/en/function.date.php).

You may also find the [Template Hierarchy](http://codex.wordpress.org/Template_Hierarchy) useful - it explains which template files WordPress loads to display different pages.