I love my Pentax!
Use the exposure mode set to metered manual mode using the [mode] button until the [M] is selected on the far right of the LCD screen
The [M} is to the right of the [Tv
] and [Av] selections.
Also, there is a switch on the camera
body where the lens is attached... switch from AF to MF (UP position) (AutoFocus to ManualFocus).
The meter inthe viewfinder will continue to work so that tou can use the built-in meter to assist in your manual configfuration.
Good Luck! Photography
is a great hobby and profession!