I need to add tabs and accordion

I have been away from web design for awhile, but I need to update an old site which relied expensively on tabs and accordions. God help me, I cannot remember how to edit them and have been unable to find any relevant help. I am using the current version of Dreamweaver. The site works OK when I view through a browser, but I have been unable to add the tabs or accordions.

I would be most appreciative for any help you could render! Many thanks in advance.