I love how 20 years ago, the standard response was always "RTFM" and over the years it's changed to "Google It".
It's vanilla responses like that which created a need for sites such as this, to help those learning a new environment to be able to do so with ease and find friendly assistance...
Once you have completed ssh-keygen, it will save your keys to ~/.ssh (/home/username/.ssh) as id_dsa and id_dsa.pub
Copy the contents of id_dsa.pub to ~/.ssh/authorized_keys on the server you wish to scp to, and make sure /etc/ssh/sshd_config has AuthorizedKeysFile %h/.ssh/authorized_keys uncommented (remove the #), and restart ssh, usually '/etc/init.d/sshd restart'.
Please note, you will have to assign a blank passphrase during ssh-keygen to make it passwordless. This is a giant security hole, as anyone with a copy of your private key, id_dsa, will be able to authenticate as that user.