This topic answers your questions about how to send messages to one or more recipients:
How Do I Compose and Send a New Message?
How Do I Reply To a Message?
How Do I Forward a Message?
How Do I Check Spelling in My Message?
How Do I Add Contacts from Address Book?
How Do I Ask For a Return Receipt When I Send a Message?
How Do I Respond To a Message That Asks For a Return Receipt?
How Can I Send an Encrypted or Signed Message?