Open your cPanel, find where SSL section is
Click on Certificates
Find your server and it valid certificates and click on Edit
Scroll to bottom, right click on the link and copy it
The link is something of the type:
https://…../…./frontend/paper_lantern/ssl/viewkey.html?id=c99d7_26a03_39730483e85009664387718bccb5fb96
c99d7_26a03_39730483e85009664387718bccb5fb96 is the key and it location is:
/home/YOURACCOUNT/ssl/keys/c99d7_26a03_39730483e85009664387718bccb5fb96.key
and the certificate file is:
/home/YOURACCOUNT/ssl/certs/someting_c99d7_26a03_something.crt