When you type an address in the To, Cc, or Bcc field of a message you're composing, Gmail will suggest addresses from your Contacts list. Hit Enter to choose the name at the top of the list, or scroll down to choose a different address. If Gmail doesn't suggest the address you want, just continue typing.
Gmail will first suggest the addresses you send mail to most often. To view a complete list of your most frequently mailed contacts, click Gmail at the top-left corner of your Gmail page, then choose Contacts. Next, click Most Contacted.Edit and select message recipients
When you’re composing or replying to a message, hover over a contact’s name to see the email address associated with it, and double-click a contact’s name to edit it. If you have multiple email addresses linked to a contact, you’ll see your contact’s email address as well as name (e.g. John Smith (email@example.com).
If you’re addressing a message to many people and would like to select multiple contacts, you can hold down the Ctrl key or the Cmd key on your keyboard and select multiple contacts.
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