The top navigation has some links that will not click.

Hi
I am an seo guy. I haven’t used WP much the last few years because clients were doing other things. One of my clients, who is a good friend, commissioned a new site in WordPress. So far I am having a lot of problems I never had in the past.
On some pages I copy text from the old site, done as block paragraphs, and they display properly. On other pages text appears as indented paragraphs, even though set to go block and copied as block.
The top navigation has some links that will not click. There were empty pages for them and the pages are gone without me deleting them. Can someone tell me how to delete these nav items so I can replace them with functional pages/subpages?
Thanks so much up front.
one last thing. there are categories in the dashboard for museum, Restaurance (yes spelled that way), museums, things like that. I can edit them and publish them but they do not show up anywhere. The contractor in a reply to one of my emails told me : The restaurance thing is directly through wordpress, that has nothing to do with our software. Not sure why they named it that. We don’t have anybody who uses that.
Stu