If you want to send a message to more recipients, you can either type their email addresses manually and separate them by a comma, or you can use the Contact Picker - a usefultool allowing you to add more contacts from your contact list.
To use the "Contact Picker", please do the following:
When composing a message, click on the "To" link or "Contact Picker" icon.
Select the email addresses of intended recipients and click on the "OK, add recipients" button.
Contact Picker also allows you to search for contacts from your contact list using the search box and "Search" button.
You can also filter your contacts by categories using the dropdown menu.
The "All" and "None" links allow you to select and deselect all contacts.