Can anyone tell me how to unlock the transection in between?
You mean unlock it before the timelock has expired?
I'm afraid that's not possible, unless you've accidentally made a mistake while creating the timelock.
This is what Achow mentioned on my other thread:
A transaction with a timelock means that the transaction itself cannot confirm before the timelock (either a block height or a timestamp). However a conflicting transaction (one that spends the same inputs) could be created and that transaction can still confirm.
In order to make coins that are unspendable until after a certain time or block height, you will need to create an address that uses OP_CHECKLOCKTIMEVERIFY. Only coins sent to such an address are guaranteed to be only spendable after a certain time.
Source:
https://bitcointalk.org/index.php?topic=2415595.msg24712001#msg24712001