How to forward e mails to a different e mail address

Thanks for being there with me on this. What I did was go into my iMac and followed your info and change the user in Setting making my wife account in there. Then was able to follow the rest of your example with success to change her iPhone. Thanks

Thanks for answer. Let me go into more details. My wife uses G Mail on her laptop and iPhone. She clicks on the Apple small blue box with white envelope on bottom of iPhone on the small blue square with white envelope to go into he mail. We desire to automatic forward all of her mail from old e mail address into new address. I know how to do it on my computer receiving mail from MSN onto gmail. But at lost on my wife's question.