Non Directory Items in Menu?

I’m not sure I’m understanding the Main Menu – I would like to be able to add “other” items to the menu such as informational items on the association which has a member directory, such as how to join, etc. Am I able to do that or can the menu only be GeoDirectory items such as Add Listing, etc.? (If there’s an article on this, would love a link, I couldn’t quite find anything specific to the question).

I created a custom post type for the members (called CBATI) and I do see it in the menu, but when I try to drag it into the main menu in the Appearance section it just says “no items”). I’m assuming I’d be able to add the post type to the menu to search the directory rather than individual members listed in it?

If it helps, the site is http://obats.firelinkonline.com/