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You forgot { after if(warn <=2)

Код:

dcmd_warn(playerid, params[])
{
	new
		warnID,
	 	Reason[128];
	if(Player[playerid][admin] < 1)
 		return SendClientMessage(playerid,COLOR_RED,"You Dont Have Right To Use This Command");
	if(sscanf(params,"ds",warnID, Reason))
		return SendClientMessage(playerid, COLOR_RED, "|| Usage: /warn [playerid] [reason] ||");
	if(!IsPlayerConnected(playerid))
		return SendClientMessage(playerid,COLOR_RED,"Nobody is connected with this ID!");
 	new
	 	wString1[128],
        wString2[128],
	 	wString3[128],
	 	warn,
	 	Name[24];
    
    	SetPVarInt(warnID, "PlayerWarnings", GetPVarInt(playerid, "PlayerWarnings")+1);
    	if(warn <=2)
	{
		GetPlayerName(playerid,Name,24);
		format(wString1,sizeof(wString1), "**(ADMIN WARN)** %s(%d) %s",Name, warnID, Reason);
		SendClientMessageToAll(COLOR_RED, wString1);
		format(wString3,sizeof(wString3), "You Have Been WARNED By Admin For: %s",Reason);
		SendClientMessage(warnID, COLOR_RED, wString3);
		format(wString2,sizeof(wString2),"%s(%d)(Has Been Forced To Read Rules)",Name,warnID);
		SendClientMessage(warnID, COLOR_RED, wString2);
	}
	else if(warn >=3)
	{
		format(wString1,sizeof(wString1), "**(AUTO KICK)** %s(%d) To many admin warnings",Name, warnID);
		SendClientMessageToAll(COLOR_RED, wString1);
		format(wString3,sizeof(wString3), "You Have Been WARNED By Admin For: %s",Reason);
		SendClientMessageToAll(COLOR_RED, wString3);
		Kick(warnID);
		return 1;
	}
	return 1;
}

And as I can see "warn" is empty, since you are making new variable:
new warn;
and then check if(warn >= 2) but warn will always be 0 since it's not set.. :P