the adress said to put general delivery before the city, but i forgot to write it... will that effect anything

Answer 1

offten is so.some where auto fill may fill it .it could be send occasionally but in dead time returning it depends on delivering sensitivity

Answer 2

Yes, the item you sent will most likely be returned to you if you put a return address on it. Otherwise would just go to the dead letter office. It's not likely to be delivered.