.... as he explains there should be games to choose... anyway. here is a link for servers.
http://www.gametiger.net/search?game=all&mod=esf <--- click the link.
ok.. what i do is copy past the IP. then i am going to esf . then going to console. and i type Connect (the ip)
*example: Connect 67.69.154.70:27016 ,when you did that, press enter and you connecting to the game
.. dont know how to use console?
Right click on HL.exe . click on shortcut.. now select the shortcut . right click on it. and select propeties... you see something like c:\sierra\half-life\hl.exe right?
now.. add this so you see: C:\sierra\half-life\hl.exe -console -game esf
then when you are in ESF you see in the menu CONSOLE.. you can access the console INGAME to by pressing ~ button.
i hope it works now for you