Error with EC2 Password Authentication

Question: How can I enable SSH login with a password instead of a private key (.pem) on my EC2 instance?

Details:

1. I followed the instructions to modify the '/etc/ssh/sshd_config' file and changed: Before: PasswordAuthentication no After: PasswordAuthentication yes

2. Then, I restarted the sshd.service. However, I still get the following error when trying to log in with a password: No supported authentication methods available (server sent: publickey,gssapi-keyex,gssapi-with-mic)