Save the file bellow as anything_you_want.pem
The easiest way to save it is to click the raw
button to see only the text, and then use your browser's file>save
menu.
On Firefox, open the Options
screen. Click the Advanced
tab. Then click the Certificates
tab and then the view certificates
button.
Click Import
and search the file you just saved. If you forgot were, just save it again :)