I came across this a while ago and probably should have posted then. Better late than never eh?
If you add an @ before somebody's user name they will get a notification saying they have been mentioned in a post. For instance, if I'm replying to Tracey but want to bring Fordy into the conversation I would put the @ before his name, it would turn blue, and he would receive a notification. He can then join in the conversation (probably about bacon sandwiches)
This is what it looks like if you have done it right - FordyP
Have a very jolly May Day weekend everybody and, for those living in the UK and Ireland, try not to get frostbite.
The image above is of a snow storm descending on South Shields two days ago. It's much the same today. I fear for my rabbits; they're not used to this weather.