Depending on the settings, only admins may be able to give orders to the bots. Once installed, the first time you run the game (local server or singleplayer) you will be recognized as the host and automatically added to the file "Left 4 Dead 2\left4dead2\ems\left4bots\cfg\admins.txt".
To do this, go to your Steam library tab. Then right click on L4D2, and selet properties Next select the tab Local Files. The select Browse Local Files You will want to navigate to this folder C:\Program Files (x86)\Steam\steamapps\common\Left 4 Dead 2\left4dead2\cfg If your Steam library is on your C drive, you can paste this string into your Internet Explorer address bar.
rEOVOw.