Hold your finger over the image and some icons will pop up one should be 'Save Image' tap and your picture should appear in 'photos' in your 'camera roll'.
tap the photo so it is showing on the screen on its own.
You should then see a box with an arrow sticking out of it in the bottom left hand corner - tap it and up will come loads of options - bottom line first one should say save image tap that.
Mikey4444 you have to hold your finger on the image for a second or two and then you will get the option to save it. If you just tap twice you only get the option to copy or select all.
If Mikey isn't getting the control centre options it is possible that the picture isn't an attachment but a link to the picture on a hosting site. Mikey, when you get the 'copy' option up what does it say in grey at the top of the box?