Categories Help and video uploads

How you can remove Categories: part you will need to add the code below at the bottom of your theme’s functions.php file:

add_filter( 'get_the_archive_title', function ($title) {
    if ( is_category() ) {
        $title = single_cat_title( '', false );
    }

    return $title;
});

And when it comes to uploading videos and plans you have to contact your websites hosting company.