heres my instructions if you downloaded the ESF bots from Red Saiyan.net.
the instructions are on the read me file, its basic enuff to understand.
to get the bots on your created server, you must have console enabled. First i have a new shortcut for esf, edit it so its change from -game cstrike to -game esf, then at the end of -game esf put a space then type "-console" without the quotation marks.
now while in the game just press this key `which is next to 1.
now once your in the console type: addbot
assuming you have just created a server and havent changed the max amount of players to join you can only add 8 bots.
Have fun, if you need more help, just post back.