Problem implementing Sub Menu on Layers Theme

Hi,

I have created the main navigation in my theme and about 6 sub menus. I have used the Page Attribute function to add my child page to a parent page, however none of the sub menus are showing.

My website address is: https://www.onlinefitnesslessons.com/pole-dancing/

Thank you in advance for your help and time.

Regards

Sarah.