Do you want to use WIP 9 or just Realbot version1?
If you want to use the WIP you will need realbot_MM.dll (for metamod).
If you want to use realbot 1 then check out this thread
http://forums.bots-united.com/showthread.php?t=899
i don't use steam, but you should be able to find out how to install it from here.
try this thread
http://forums.bots-united.com/showthread.php?t=218
it should help you with your problem.
and just a gently reminder

, use the search to see if your question has already be coved next time please.
hope this gets you going.