Unfortunately we don't currently have a way to edit or delete a transaction once it's been made. This means if you've made a Boost, a Remove, or an Allowance incorrectly you can't get directly delete or edit the transaction.
This is on our roadmap and we are hoping to introduce it to the app in the not too distant future.
For the time being, the best thing to do is an extra Boost or Remove to reverse the transaction.
You could even add "Reversing X transaction" as the reason for this so it is clear to your child why you have done it.
If you’re unsure how to make a Boost or Remove please see our help guides on how to add money onto your child’s account with a Boost here or how to remove money from your child’s account with a Remove here.
If you have any questions, then please get in touch with the team via the Contact Us button in the app or via firstname.lastname@example.org.