From this page you cand send a IM or SMS message to a person. For this all you have to do is choose the way you want to send the message (by Instant Messenger or by SMS) and enter the person's Instant Messenger ID or Phone Number, write the message and chick "Send It!"

Please note that if you are sending a message to a friend by Instant Messenger and this is the first message you send him/her this way, they will first receive a reqest to accept messages coming from you. Only after they confirm that they want to receive messages from you your message will be delivered.

If you are sending a SMS please enter the phone number in international format (eg. +44-1234567890 for UK)