It's easy to add any desLibris subscription service to your library account for trial purposes.
Select the content and configuration you wish to add, and click on the "Place Order" button.
This will activate the content requested on your library's site immediately.
Although an invoice will be generated, there is a 30-day grace period before payment is requested, so this may be regarded as a trial period.
To close the trial and cancel the invoice, use the "dispute" button on the invoice site.