Download the released version it appears on the right of your screen and also download run.bat and edit your info in the file there
or run this on your cmd (must be in the same directory)
java -jar KF2DiscordMut.jar port webhookURL SteamAPIKey CDAVatarURL(optional) DiscordBotToken(optional) ChannelID(optional)
fill 0 in optional arguments if you don't want to use that
You need to provide DiscordBotToken if you want msgs to be sent to the kf2 server as well as ChannelID