missing next & previous links

https://www.ibizaa-z.com/blog

the blog has been running fine all summer but theres been one niggly thing that is now beoming an issue and thats not having the next/previous links – it means that no-one can see more than 10 posts irrespective of whether they use the archive, category, search etc – ive looked in the php files and i cant see anything thats been commented out so i’m looking for the code i need to add (i assume in the footer file)

cheers