Click WHATS NEW that you see on that blue line with all tags and stuff. Youll be directed to whats called the Activity Stream, where youll se other members' updates. If you have any notifications youll find them on your top left. If you dont see anything, that means you havent got any notifications.
Go to the group, and you'll find a box where you can write a question or anything but its better to post a in the Forum
For that: when you got to the group. There'll be four options to choose from over the description of the group, on the black script; Home Forum Members Send Invites. Click FORUM. Then Click on NEW TOPIC
Yes you can. Click on the GROUPS icon on that same blue script on the top of the page. Youll be directed to the list of groups and there ll be a search box too
.These are your Q and A reputation point. The more plus votes you get on your answers in the Q and A, the more points youll have. But apparently, you have lost one point, i dont know why