If you get the menu when you hit "h" and you are able to select "add bot....." and it doesn't add a bot for you then it is as Josh Borke said earlier, the commands in your "command.txt" file are wrong. Have a look at it, it's ".../counter-strike/cstrike/command.txt". Make sure the commands after "Add bot" are the same as the ones you give in the console. You could try downloading this command.txt from the filebase --->
http://realbot.bots-united.com/files/commandmenu.txt
Rename your old command.txt and replace it with this one... Hope This Helps