Set Page Count (pagination) in Epub, How to

Page count for my book is 104 pages on Amazon.

Want it to be 100 pages to fit in a specific category.

I asked KDP how to do this and they told me I to "change the pagination of your eBook, please resubmit your book using the desired page numbers in the eBook’s ePub file."

I've been researching this a lot but still have no idea how to do this!

PLEASE HELP!

I will be forever grateful.

Willing to pay someone to help if that's the case also.

TIA