I'm using Coin Space wallet. First I send a test transaction and this one was confirmed quickly. I send next one the day after and I had to lower transaction fee. This transaction is sitting unconfirmed for the last two days. I'm new to BTC and I wish I knew about all the nuances with lower fees and options related to different wallets. This one does not have Replace-By-Fee option. Is there any other way cancel this transaction? Please advice. Thanks!