Downloads - Keynote Presentation

Hello,

I just recently joined and I may be doing something wrong but I have downloaded a keynote presentation theme on envato elements. I was wondering if anyone knows how to firstly use the download and save it somewhere either on your computer or iPad. In this situation, specifically how to download it to your keynotes on an iPad.

If you could help that would be great.

Keynote User Guide for iPad
https://help.apple.com/keynote/ipad/5.1/?lang=en

and https://support.apple.com/kb/PH24308?viewlocale=en_US&locale=en_US

I hope it helps!