This is the transaction.

https://blockchain.info/address/1F8EP97jgQx8QD6XMRg2bCHHrJrZEMUTRt

Which is still unconfirmed.

I am trying to use https://coinb.in to create a double spend transaction with a higher fee but I am getting several errors such as:

18: txn-mempool-conflict How can I create a double spend transaction using https://coinb.in to block this attack?

This is the transaction.

https://blockchain.info/address/1F8EP97jgQx8QD6XMRg2bCHHrJrZEMUTRt

Which is still unconfirmed.

I am trying to use https://coinb.in to create a double spend transaction with a higher fee but I am getting several errors such as:

18: txn-mempool-conflict OR 16: mandatory-script-verify-flag-failed (Script failed an OP_EQUALVERIFY operation)

How can I create a double spend transaction using https://coinb.in to block this attack?

In particular what goes in the transaction id field and the script field.