To send an instant message:
Double-click a contact, and then follow Step 3.
or
If you want to send a message to someone who is not in your Contact List, click Send a message, and then follow Step 2.
Click Find User, select Use this User ID, type the user ID of the person, and then click Finish.
or
Click Find User, select Search for a user, type all or part of the name you are looking for, and then click Next. Select the user you want from the Search Results list, click Add if you want to add the user to your contact list, and then click Finish.
or
Click Find User, click Advanced, click begins with, contains, or equals from the drop-down list next to a field, type the information you are looking for in the field, and then click Next. Select the user you want from the Search Results list, click Add if you want to add the user to your contact list, and then click Finish.
Type your message.
Click or press Enter.