UDP Flooder Need Help

Im using the UDP Flooder to cause a connection lag for various reasons.
It is suppose to effect a certain device with a certain IP but how another tutorial told me to do it, is that you put 27.27.27.27 in the top space, leave data, and put the spped up to ten. This doesnt seem to work and if i put in its ip it causes dissconnect after a minute or so. The net tools computer is wireless and so is the device im trying to effect. Im guessing what they're trying to do is flood the modem but its not workinng at all like they said. I know im being kinda vage but some help would be appreciated. Thank you...