sending to a group on a mac running osx maverick

A friend asked me and I don't know the first thing about macs.
They made a 'group' in their address book under icloud.  in there are several people's email addresseses.

How do you get the group into one of the lines - to , cc, bcc?

Googling, I found you can type the group name, hit enter and then you get each email address.

but some sites say you can drag the group up to the to, cc or bcc line to do the same thing.

when I do that, the icon for the group falls back to the address book without populating the address line.

and highlighing the group name on the left of the address book and pressing to, cc or bcc in the address book, I get just one name of the group that happened to be highlighted.\

thanks!