To initiate a data awarence 'grid control'

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I try to query data from oracle data base, using Jdeveloper (old version 3.2).
I can successfully make a oracle data base connection nicely. And I can get 'select sysdate from dual' query nicely and put sysdate into a label-control and a grid-control. but, seems like I miss a step to initiate a data awarence component.

At this moment, I cannot make a query like 'select * from table_name' to work properly. Of course, the following step to link data into 'label-control' and 'grid-control' are failed.

If someone come across this forum and could make a suggestion, it will be very much helpful.

Thanks