Go to the KAZI Developer Portal (https://kazi.portal.azure-api.net/) and sign up.
Click 'Subscription Plans' in the top menu and subscribe to the 'Tester' subscription. The default name for this subscription is 'Tester' but you can change this to your liking.
Once your request has been approved by the KAZI API Team <How long does it take to approve a 'Tester' subscription request?> you can start testing the service. A good way to get acquainted with Kazi's API's is to look at the example provided in the article 'Example: Jolly Good Jobs' in the section 'Getting Started'.