This feature is only available to the "Owner" of the account. Once logged in as the Owner, you are able to print your organization's receipts and statements. You can also give this access to your treasurer by following the steps in this article on Giving Your Treasurer Access to the Billing Profile.
Steps for printing a statement:
First, click on "My Profile" in the top right corner
Next, choose "Organization Settings"
Finally, choose the "Billing and Payment Settings" tab and choose the invoice you would like to print