You'll see a prompt like this:
Enter file in which to save the key (/Users/username/.ssh/id_rsa):
To use the default location just hit enter.
It's advisable to enter a passphrase, but it isn't necessary. You'll need to repeat the passphrase or just hit enter to skip.
If you accepted the default settings, your ssh key will be located at ~/.ssh/ida_rsa.pub.
To view the key you can type:
To use it, you can add the key to your home directory on a remote server at ~/.ssh/authorized_keys. If you have to create the file you can use:
Ensure the permission of the .ssh and authorized_keys files are correct:
chmod 700 ~/.ssh chmod 600 ~/.ssh/authorized_keys