To send a video or picture (MMS) message:
- Tap Messages
- Tap Compose
- Enter a phone number or select Add Recipient to choose from your contacts
- Once you've added all the contacts you want, you can add a photo or video by tapping the camera icon next to the text box. You'll be given the option to either take a new photo or video, or to upload one you've already got saved. When you've finished, tap Send
Your message will now have been sent.
For more help go to: http://www.apple.com/uk/support/iphone/phone/