The question is simple: how do I unlock that trade and get hold of the rest of my bitcoins? Thanks to those who want to answer me.
You can follow BitCryptex's suggestion to remove it from your history.
If you do that, the funds from that transaction will return to your available balance because it wasn't "
processed" in the first place.
To properly send a transaction, you need to directly click "
send" after filling out the address, fee, amount, etc. (
next version will be different)
If you have to use "
preview", make sure that you will click "
broadcast" after viewing the transaction's info.