in the doc https://www.amebaiot.com/en/ameba-arduino-amazon-aws-iot/
"Next, fill in the certificate we created in the AWS IoT Console (i.e., client certificate), usually its file name ends with "-certificate.pem.crt" (e.g., "efae24a533-certificate.pem.crt"). Open the certificate with a text editor, and adjust its format as follows to use in the sketch:"
Where can it get these 3 fields ? Or create this 3 fields ?
Not clear for me!