If you need to mark a record as 'Do not send' within FreeAgent, you can do so using the following steps:
Go to Commusoft.
Open your company settings and open 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.