Hubzilla is made up of a number of "applications". When you first register an account, most of them are available from the menu in the upper right hand corner of the page. When you click on the menu the applications are displayed.
Instead, what I find particularly useful is to put the menu items on the menu bar for easy access. This is done by selecting the Add Apps menu item and clicking on the pin for each app you use regularly and want quick access to.
When the pins are green they application icons will display in the menu bar.\