Hi Peter,
First, you need to set up a child theme and activate it by following our guide here.
Then you can add a slider to your category page using an action and revslider shortcode.
Please add an example code below in your child theme’s functions.php and set your parameters there.
function add_my_slider() {
if(is_category( '78' )) {
echo do_shortcode('[rev_slider alias="test"]');
}
}
add_action( 'action_name', 'add_my_slider', 10 );
is_category() is a WordPress function which accepts category slug, category ID etc which you can read from here.
action_name parameter can be replaced with any hooks mentioned here. In your case, you can try the following hook x_before_the_content_begin.
Change [rev_slider alias="test"] with your slider shortcode.
Please be reminded that this is a customization and outside of support that we can offer, please take the snippet as a guide with the understanding that it would ultimately be your responsibility to take it from here.
I hope that helps,
Cheers!