Find the pic and on the lower dock, left hand side, is a blue square with an arrow pointing upwards. The lower dock then changes and 12 options including Mail are there for you to chose...
That should read: Find the pic and on the lower dock, left hand side, is a blue-lined square with an arrow pointing upwards. Touch that icon that then shows 13 options including Mail that are there for you to chose...
hold your finger on the message area.
A pop up will say select Select all Paste and then an arrow.
Click on the arrow and the pop up will change to insert photo.
This will take you to your camera roll to select the pic.