Set the config path to the new config file

The file config_aws2 is like below

Host 18.abc.xyz
  HostName 18.abc.xyz
  User ec2_user
  IdentityFile C:/Users/dcnha/Desktop/nha/dance_motion/aws/AIkey.pem

set the permission of the .pem file only for your current user (Windows, https://youtu.be/kzLRxVgos2M), using chmod for Linux

When this dialogue show up, do not click the 18.abc, instead type in [email protected]