If anyone is having problems, like I was, Sarah Gooding’s solution worked for me. To be specific, do the following:
~ click on Groups
~ click on a Group – you should then see “Home – Admin – Forum -Members (4) – Send Invites” in its’ menu
~ click on Admin
~ click on Group Setting
~ check the box for “Enable discussion forum”
~ save changes
Now when you go to Forums in the menu, you should be able to click on New Topic and save it. Thanks SARAH GOODING – you’re the best!