That's 3 posts

and your light is bright green at the moment, so is mine. That's because we are both online.
If you click on dunscore (not online at the moment, so not lit up green) you can then see the option to "Send a PM" (a personal/private message

) So you could, if you wanted to, use that option and send dunscore a PM
And now that you have made those 3 posts, RChat can see you are not a scammer, and so your inbox won't come up with a message about it being full, so dunscore can send you a message too...
Cheers, JM