Hello Jon
As you are using the QuickBook Self Employed account there is not a way to edit the existing sign in information.You can either go to add the account again using new log in details (without disconnecting the existing connection,you would need to stipulate when it asks for the date range that you want from where the connection stopped updating so that you do not end up with any duplicates..
Alternatively you can disconnect the existing connection and then re add the account using the new details. and we can then reach out to our tier 2 banking team to ask them to pull back through the deleted transactions(when you disconnect a bank account in Self Employed it removes all transactions that were ever connected to the account from the transactions section)
If you decide to do the later let us know we will just need some details to pull the transactions back into the account
Thanks
