Cabri Jr. is an APP found under the APP key.
(If you do not have Cabri Jr., follow the link below to download a free copy.
You may need to upgrade your OS (operating system) prior to downloading Cabri Jr.

The Cabri Jr software is controlled by the 5 menu keys below the viewing window.  When the software is running, these 5 keys, referred to as F1, F2, F3, F4 and F5, produce drop-down menus to control the software.  Arrow keys are then used to move within each of these menus. 
The symbol ►indicates that there are additional options -- arrow to the right.

Dynamic Geometry
with Cabri Jr

From the TI website:

• TI Cabri Jr. Download
& GuideBook