First you need to prepare your data for export by selecting a Preset Search or creating a Custom Search and saving it. You must add the columns that you want included before you export. To find out more about adding columns, read How to Add Columns.
When you are ready to export, select Actions near the top right of the screen and click Export CSV.
Exports that you create on Organise are sent to you by email as an encrypted and compressed file and you will need a file reader installed in order to unzip the file. On Windows you can use 7zip or on Mac you can use Keka - the password for the file is your membership number.