You will need some kind of a terminal application in order to connect to the remote Linux computer. You will be connecting using the SSH protocol. There are many Windows SSH clients you can use. Here are some popular ones:
Mac OS has a built in terminal application which you can use to make an SSH connection to citstudent. It is called simply Terminal and you launch it like any other application.
The command for connecting to a remote computer using the SSH protocol is:
ssh username@citstudent.lanecc.edu
where username is your user name.
Regardless of which one of these SSH clients you use, you will enter the same commands. Here are instructions that list the commands you need to use to change a password: Changing Passwords.