Apache NIfi Classpath for custom jar

When NIFI is used to push data via the Azure Datalakes HDFS interface, one needs to add the respecitve hadoop-azure-datalake-3.3.0.jar file like described in the documentation. However, I’m not completly sure whether everything there applies to this case as there is no local hadoop installation, there just is a NIFI which should use HDFS in Azure.

This documentation also has a troubleshooting entry for my exact error message. However I fail to apply the suggested solution in my NIFI-Case.

How can I add the folder of the above jar file to NIFIs classpath?