Unfortunately no one can be told what fun_plug is - you have to see it for yourself.
You are not logged in.
If you're using private messages in this forum, be aware that your mailbox has limited capacity (about 10 messages or so) and that you cannot receive messages (e.g. answers to questions) if your inbox is full...
I hadn't realised this forum allowed private messaging, I'd never sent one and as far as I knew, never received one - but - I checked, and was quite surprised to find a PM sent a month ago.
It actually shows how many percent you have used/free in your PM box ( http://forum.dsmg600.info/message_list.php ). Also you will have a note in your upper menu about non viewed messages. When I get some time I might modify the message to make it look more visible (color+size or something like that).
Total message limit is 20 messages and it has been this since the beginning of this feature (2006-08-23).
All updates and new features will be posted here.