The three forms are PSUC campus, SUNY campus, and other. The second form you can use for a friend that has an account in another SUNY school. You have to know the school address. Below are examples of my address in the three forms. After you type in the address, first you will be asked CC .
CC stands for carbon copy.
If you enter in an address that person will receive the message also. Second, you are asked for the subject of the message. This is helpful for the person getting the message. Know you can type your message. When you are finished push control-Z and type exit .