using scripts, specifically, hud commands and variables. you'll have to read through the Ched80 syntax list as a guide
http://forum.thegamecreators.com/?m=forum_view&t=180924&b=23
and always remember, this is not a request board
http://forum.thegamecreators.com/?m=forum_view&t=126004&b=23
We will help you if you've got a script written already and it is not working, but we won't make them for you, and if you don't want to do that, try using the search bar. You might find what you're looking for, if you are lucky.
http://www.youtube.com/watch?v=AfFa6uPv_8o
I appear to have burst into flames...
