To send an email to a group you need to go to people >then move bottom tab to group > then select the group you want to send a message to > move the bottom tab to group action and select send group message.
Its not as easy as it should be but it does work.
I wish there was a better may, maybe with 2.2 they will add a new option.
I cannot believe that it is impossble to send to a group from Gmail w/o going in to people. I am trying to share a news article and can't. I was trying to forward an email to a group and can't. That is B.S. I expect more from a google product uses a google product.