Modify Feedback by Paragraph

Can anyone please help me out with applying plugins to specific categories?
I’m using Feedback by Paragraph.

I tired this:
Found these lines in the plugin:

add_filter('the_content', 'FBP_preFlight');
add_filter('comments_array', 'FBPfiltercomments', 1);
add_filter('get_comments_number', 'FBPfiltercommentcount');
add_filter('comments_template', 'FBPcommentsmessage');

And wrapped them in an if statement as follows:

if( in_category( '1' ) ) {
    add_filter('the_content', 'FBP_preFlight');
    add_filter('comments_array', 'FBPfiltercomments', 1);
    add_filter('get_comments_number', 'FBPfiltercommentcount');
    add_filter('comments_template', 'FBPcommentsmessage');
}

I replaced ‘1’ with the ID or slug of the category I wanted to limit the plugin to.

this didn’t work… any ideas?
thanks!