[DBan]

You mean wanted levels? SA-MP Wiki is your friend
As for the buttons: Simple search can bring miracles

Example:

pawn Code:

GivePlayerMoney(playerid, 200); //Gives the player 200$
SetPlayerWantedLevel(playerid, GetPlayerWantedLevel(playerid) + 2); //Gets the player's wanted level then adds to it

Button:

pawn Code:

//Definition is from SA-MP wiki
#define PRESSED(%0) \
    (((newkeys & (%0)) == (%0)) && ((oldkeys & (%0)) != (%0)))

public OnPlayerKeyStateChange(playerid, newkeys, oldkeys)
{
    if (PRESSED(KEY_LOOK_BEHIND))
    {
        //your code here
    }
    return 1;
}

Well that's in my script, just edit it to your liking.