How do I save the Explain Plan

I added a table to my schema called plan_table and checked the save explain plan option. It does not write the explain plan to the table. What am I doing wrong.

Check this box:

Go to the editor, type in your statement, do a CTRL+E to explain plan:

This dialog should appear (only on the first explain plan) to prompt to create the table to store the plans. Just click OK.

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To see the saved plans, go to the main menu. Database -> Optimize -> Explain Plan.