From any search result you can select the accounts you are interested in and download the data. First craft your search so that you get the results you want.
Then select the accounts - this might me a subset of the results, or you might select all with the button.
Then choose Download from the Actions menu.
Depending on how many accounts you selected, and how many other administrators around the world are doing the same thing, the task may take anywhere from a few seconds to a few hours to complete. An email is sent to the administrator you are acting as when the download is ready.
Because downloads usually contain information that could be considered sensitive or personal by the account holders they can only be accessed from the administration site. The downloads page is accessed by the button on the homepage.
You'll see a list of all the downloads you have generated. Old files can be deleted by ticking them and selecting the delete button that will appear.