Hi Graham,
You can select "Messages\New chat" from the main menu or
access from the widget bar and select icon to create text/
multimedia message. You can type a message and you can also
modify a predefined message in Insert template or customise
your message by adding pictures, records, videos, etc (only
available while editing a MMS). While writing a message, select
"Options" to access all the messaging options.
For dual SIM model, you can type a message and select to send
it to a recipient in either the SIM1 or SIM2 directory (1). One or
more recipients can be added from contact list. Press "Contacts"
through key to multi-select recipients from Contacts.