If you'd like to mark a record in KashFlow as 'Do not send', you can do this by following the following steps:
Go to Commusoft.
Open your company settings and go to the 'Accounting interface' section.
You will see the accounting interface dashboard. Click 'View' in the section where the record will be.
Navigate using the tabs across the top of the page.
Select the record, click 'Mark as do not send' in the top right of this page.