Adding Arrow pagination on wordpress site on homepage

has to be done over anydesk,will not provide you access to admin i can do basic code, but you need to advise me on the code and how to add arrows to the top two rows on the homepage (https://faculti.net)

cat page: https://faculti.net/prof/law/
where this functionality is already implemented need it done in next 2 hours

budget is 15 usd