To enable public-key authentication with your key pair:
Check that your keys are stored in the default location: 
the $HOME/.ssh2 directory on Unix, 
(the "%APPDATA%\SSH\UserKeys" directory on Windows).
Connect to Server using your password.
Use the SCP tool to upload your public key to the server, 
to your default authorized_keys directory, 
$HOME/.ssh2/authorized_keys on Unix servers, 
("%APPDATA%\.ssh2\authorized_keys" on Windows servers):
$ scpg3 id_dsa_2048_a.pub ServerUser@5xServer:.ssh2/authorized_keys/
The server will then use the uploaded public key to authenticate you when you log in after this.