Create the config file under your .ssh folder.
Ex. /home/ykyuen/.ssh/config
Host remote1 HostName www.remote1.com User ykyuen Host remote2 HostName www.remote2.com User kit
So instead of
ssh ykyuen@www.remote1.com
Just type
ssh remote1
Done =)
Reference: Matt Ryall – Configuring your favourite hosts in SSH