Or u can take a picture of the page by holding down the power button at the top of the phone and the button on the front of your phone at the same time. Push them at the same time quick. Then go to photos and forward the pic to their email.
There is no way to send e- mail from your messages... But if you want to send something that you have in the messages just copy the text or pic and paste on your e-mail and send it, To do the copy and paste just hold the finger in the text or pic for two sec and press copy or paste..... This is only if you have iOS 4 and up