To use the Card Manager , you will need to have a Privacy account. You will then need your Privacy Account API which can be found in the Account tab on www.privacy.com. If you do not have a Privacy account you may sign up here and get free $5 credit when you sign up.
After applying the Privacy API key, made sure to press Save within your Settings.
At the time this guide was written, the current version of Wraith is 2.0.0 and is subject to change.