Update/add two SSL certificates/keys on AWS (Amazon)

Job ID: 34191002

Budget: $30 – $250 USD

I need help updating two SSL certificates from a third party (www.loopia.se) on Amazon that host my two domains:
www.keyconnect.io
www.keyconnect.se
I have access to the keys and to AWS, but don't know what or how to do this.
Guess this is something that only takes 5-10 minutes, but I don't know where to start.
Also need to know how to download the keys, so I can add (or if you do it).
Related categories: PHP System Admin Linux Amazon Web Services Web Hosting