I've installed all the CB modules and components. I installed the Fireboard component. I can add menu items to show user profiles and login and so forth.

How do i add a menu item to display the tabs to the user?

Not sure your question makes sense.

If you are wanting tabs in the user profiles with fields or other content in them, I suggest checking out the CB Tab Manager in the admin backend.

From admin menu:

components / community builder / tab management

Create tabs there and position then.

Then go to the Fields manager and assign the fields to the tabs you want:

components/ community builder / field management

If you are just trying to get the user profiles assigned to a menu item, create a new menu item type component and select community builder.