Hey there, we played L4D2 recently and you basiclly showed how to use the !jumper and !buy feature. Question about that, how can I active it? and is there anything I should know about this feature. I had a lot of fun using !buy and !jumper and I miss it. thanks for you time and help!

why

Got kicked out at the end of the last game, so I went to bed instead of restarting