Hello - I hope I understand your problem properly, and if I haven’t then just ignore this 
From what I can tell you could do either of the following:
- I always create my menus using the built-in wordpress menu creator (Appearance > Customise > Menu > Create new menu) . From here you can add archive pages, categories, posts, pages and more. Then I use the default Bricks “Nav Menu” widget in my header template and select the menu I just created from the dropdown. This works great for simpler navigations that are just one level or only need a basic dropdown (you add the dropdown elements when you set up the menu as well). If the menu is more complex and you want to use the nestable menu widget, I don’t know if you can still pull in the Wordpress menu there, but if you can’t -
- You could just open your archive page in the browser, copy the URL, and then paste that link onto the nav button link as an “External URL” from the link options.
Hope that helps. There’s probably a cleverer, more solid way to this, but in the meantime at least this will get you up and running.