Whenever you click Apply on the JNDI Panel, Enterprise Manager will enable display of the JNDI Namespace. The JNDI Namespace is displayed as a tree structure within the Namespace section of the panel. The root of this tree will be the JNDI Provider URL (in the case of a cluster, the comma-separated list of RNAME values for each server in the cluster). Double clicking on the root node in the JNDI namespace will render 6 "folders":

The image below shows this view after the Apply button has been clicked and the JNDI namespace tree has been double-clicked to expand it: