if(!strcmp(cmdtext, "/teleport"))//cmd structure
     {
        SetPlayerPos(playerid,0.0,0.0,3.0);//setting player pos to X,Y,Z cords change it to your cords
        SendClientMessage(playerid, 0xFFFFFFFF, "Hello Player!");//This will send message to player who will use this command , playeris id id of player , 0xFFFFFFFF is color and  then message 
        return 1;
     }