SSH to Instance using Mac and Linux

Setup:

1. Make sure the PEM file that was created when you created an SSH key is in your Downloads folder.
   (Here's the link for reference: Create an SSH Key)
   
   

2. Open up a terminal window, and type this command:

   chmod 600 ~/Downloads/NAMEOFPEMFILE.pem

3. Now we can ssh into the instance: (NOTE: The default username is 'centos' for CentOS based images and 'ubuntu' for Ubuntu based images)

   ssh username@YOURIPADDRESS -i ~/Downloads/NAMEOFPEMFILE.pem

4. Everything should now be setup and ready to go.