[Jarnu]

Above is for Y_ini
there goes for Dini

Code:

CMD:changename(playerid, params[])
{
        if(PlayerInfo[playerid][LoggedIn] == 1)	{
		if(isnull(params)) return SendClientMessage(playerid, red, "USAGE: /changename [new Name]");
		if(strlen(params) < 4) return SendClientMessage(playerid,red,"ACCOUNT: Incorrect password length");
		if (udb_Exists(params)) return SendClientMessage(playerid,red,"This User Name Is Taken!");
		if(GetPlayerMoney(playerid) < 50000) return SendClientMessage(playerid, red,"[ERROR]: You need $50000 to change your name!");
		new nameee[24];  GetPlayerName(playerid, nameee, 16);
		new OldName[24],str[128];
		GetPlayerName(playerid,OldName,sizeof(OldName));
		format(str,sizeof(str),"ladmin/users/%s.sav",OldName);
		udb_RenameUser(OldName,params);
		format(str,sizeof(str),"ladmin/users/%s.sav",params);
		SetPlayerName(playerid,params);
		PlayerPlaySound(playerid,1057,0.0,0.0,0.0);
		GivePlayerMoney(playerid, -50000);
		new string[128];
        format(string, sizeof(string),"ACCOUNT: You have successfully changed your Name to \"%s\"",params);
		return SendClientMessage(playerid,yellow,string);
	} else return SendClientMessage(playerid,red, "ERROR: You must have an account to use this command");
}

More examples will help you more..