The transaction is broadcast to the Bitcoin network. Once sent, it cannot be canceled. When sending less than full balance, change returns automatically (minus fee). Verify details using Decoded Transaction before sending. Your transaction has been broadcasted but not yet confirmed. Track it in the Mempool Explorer using the search function. In case of successful data entry, you will receive a signed transaction hex. You can use this hex on any external service that supports broadcasting transactions, or click "Send transaction" to broadcast it directly to the blockchain network.