Generate the relevant public/private key pair.
ssh-keygen can do this, and I have placed some links into your earlier request for help on this.
Duplicated here below.
As for getting the RSA pair to work, place the public key into the ~/.ssh/authorized_keys file on your server.
Place the private key into the working directory of your ssh client program.
(If you are using a *nix client then reread the ssh-keygen man page
In the win client, set up the host connection, and point it to the private key file you wish to use (client specific I'm afraid).
You can use just the one key pair for all of your admin, or one key per server.
(whatever confuses you the least)
If you do only use one key pair for all of your servers, please ensure:
that you choose a really good passphrase to secure that key pair,
that you don't forget the passphrase
That you do passphrase the key pair!
Use the following links to help:
Openssh man page for keygen:
Bull download site:
PuTTY Win client (has it's own keygen if you want to use that instead):
Shane