These interface features are standard in Stylus RMX:

Down Arrows Open Option Menus

Whenever you see a single downward facing arrow, this means that you can click directly on the window to reveal a drop-down option menu specific to that function.

Up / Down Steppers

These UP / DOWN arrows let you move incrementally through a list of options.
In the picture above, you can use these arrows to step through the different available LFO waveforms.

Viewing a Parameter Value

You can view a current parameter value by clicking on the parameter and not moving it. The value appears in the Value Display in the Footer.

THREE DIFFERENT WAYS TO OPEN THE BROWSER:

Opening the Browser from the FOOTER

Click on the Element Name Display or its adjacent Folder icon.

Opening the Browser from the EDIT PAGE

Click on the Element Name field at the top of the EDIT page or its adjacent Folder icon.
This is true for both the Standard Edit Page and the Easy Edit Page.

Opening the Browser from the MIXER PAGE

Click on any of the eight Element Name fields on the Mixer Page or their adjacent Folder buttons.