Resize and Adjust Book Cover for Kindle

I need my book cover resized to fit Amazon Kindle printing dimensions. The current format is PDF, and I have the required dimensions.
THE FILE IS ON CANVA.

Requirements:
- Resize cover to Kindle specs
- Adjust some design elements as needed

Ideal Skills:
- Proficiency in PDF editing
- Experience with book cover design
- Familiarity with Amazon Kindle requirements