Help editing pages to appear under subpage

Help!

I am new to WordPress and I am having an issue with Pages and subpages.

I have installed the theme bubblespark, and I believe that is part of the issue.

My issue- I have the Page title of Videolab on the homepage, and would like 5 categories to drop down under it. Unfortunately, all of the subpages appear on the home page.

If you click on Videolab, all the subpages will highlight and you can see what I am talking about.

https://videolabmultimedia.com/sacramentovideolab/

-Videolab (parent page)
Film to DVD 8mm/16mm (subpage)
Video Compression (subpage)
DVD/CD Duplication (subpage)
Memories Video (subpage)
Editing (subpage)

Thank you in advance.