Signups with which lead status can be exported (via Secure Export) are defined in this section. Access this section on the 'App Settings' tab that you can see after clicking 'Settings (cog button)' on side bar.
Turn the toggle button of the status that you want to make available for export 'ON'. The button is ON when it is shown in green. When this section is set like below, ONLY the pledge forms with Active status become available for export.
Please do not forget to press 'UPDATE' button to save the changes that you made.