Slide your finger left on the display to open the main menu.
Tap Text Messages.

Tap Compose.

Key in the first letters of the required contact.
Matching contacts are displayed.
Tap the required contact.

Tap Enter a message.
Write the text for your SMS.

Tap Send when you've written your SMS.

Slide your finger up the display starting from the bottom edge of your mobile phone to return to standby mode.