How do you make a kill?

I'm relatively new and I see a lot of members with kills. How does that happen?

[7alala]

To attack someone, you have to get relation with him.
relations are either normal (yellow) or temporary (red).
normal relations from sending relation requests.
temp. or red relations appear when someone in the same nightclub you are using at the same time.
To attack someone he must have at least 100 respect.
if your attacking power is double or more his, so you kill him and counts on ur kills.
if he attacks you, he will die..but won't be added to your kills.