a. In the main interface, tab on the "Settings" button at the top left

b. From the Settings Menu (Figure 1), select "Password"

c. In the "Password" Menu (Figure 2) set the Password switch to "ON".

d. Enter desired password.

e. Tab on the "Home" button at the top right to return to the main interface
 

Figure 1: Settings Menu                                                           Figure 2: Password Menu