In CASUS, cases cannot be published directly, but only through courses. In order to enable the integration into a Learner Record Store (LRS), you must have access to CASUS course manager. You can create and add courses using the course manager and then add xAPI/LRS settings to your course(s).
In the course itself, you will find the LRS settings in the „course data“ menu under the header „LRS Integration“. Please see course manager - integration for more details.