A few sub-pages/drop-down menu have disappeared from the main nav bar. I'm not sure if it happened as a result of an upgrade or not. The pages haven't been deleted, but they aren't accessible from the home page. How can I fix this?

I'm new to concrete5 so most of the discussions and tutorials are way over my head. I would appreciate it so much if someone was able to walk me through this fix in layman's terms.

Page version 234. Not sure where to find any other version information. Thanks.

L'Tanya