Okay nEo-1664, here's a basic translation for you. Hope it helps...
Everything is in the data transfer of the server, so all you need is a packet sniffer.
WPE Pro is not recommended because Imperium thinks it's being detected by KK.
Now here how it works...
Every player gets an ID when entering the zone. Every weapon gets an ID also that is expressed in two hexadecimals. We have to remember that for later use.
Now we come to the screenshot, in this case the weapon ID is D1 01 - after it you have to insert what to aim.
This should be "fresh air" (well, nothing) which always is FE 03. This means that you enter D1 01 FE 03 into the searchbox.
Now there is the row you want to edit, KK made it easy because you simply enter the player ID instead of "fresh air".
So you see a nub soadler spy and hit him once so you get to know the player ID (which is 02 in this case).
Then do the following: take the weapon ID (D1 01), the player ID (02) and a null packet.
This will look like D1 01 02 00. A few fields later you have to enter the aiming, where the highest possible value is 64 - full aiming means full damage.
Now enable the filter, aim nowhere and tadaa - hit the player!