How to add filters?

I am attempting to put a flashback scene into my ADVENTUROUS entry but for that I need a black and white filter, How do I add that?

Script

@PAISLEY is idle_terrified

    PAISLEY (mortified)
(It's all my fault..)

@transition fade out white
EXT. NORTH PHILADELPHIA ALLEYWAY - NIGHT
ADD FILTER HERE

@add Handgun to ____

@cut to zone 3 AND ____ stands screen right AND ____ faces left AND ___ is arms_crossed_angry

@cut to zone 1

@transition fade in white

@FLORA enters from left to screen center AND FLORA is run_athletic AND FLORA faces right

@FLORA is (WHATEVER THE ANIMATION IS THAT MAKES THE CHARACTER HOLD THEIR STOMACHS IN PAIN…)

    FLORA
(Must..)
(Keep...)
(Going...)

@FLORA is deepbreath

@pan to zone 3 AND FLORA walks to position ____ in 4 AND FLORA is run_athletic AND FLORA faces right

@FLORA is _____

???: Hello Flora and goodbye

sound Gunshot

@FLORA is faint

@cut to zone 1
&YOUNGPAISLEY stands screen center AND YOUNGPAISLEY faces right
&FORGOTTENGIRL stands screen left AND FORGOTTENGIRL faces right
&YOUNG PRUDENCE stands screen right AND YOUNGPRUDENCE faces right

@YOUNGPAISLEY is scream AND YOUNGPRUDENCE is sob_sniff_loop AND FORGOTTENGIRL is dismayed

@FORGOTTENGIRL exits left AND FORGOTTENGIRL is run_cry_offset

YOUNGPAISLEY: MAY, NO!!!

@YOUNGPAISLEY is scream

@YOUNGPAISLEY is weep_cry_loop

@transition fade out white
END OF BLACK AND WHITE FILTER AND END OF FLASHBACK

If you still need this:

Try this

@PAISLEY is idle_terrified

    PAISLEY (mortified)
(It's all my fault..)

@transition fade out white
EXT. NORTH PHILADELPHIA ALLEYWAY - NIGHT

FILTER: Black and White

@set hsl 0 -100 0 no_colorize with blendMode NORMAL to 100%

@add Handgun to ____

@cut to zone 3 AND ____ stands screen right AND ____ faces left AND ___ is arms_crossed_angry

@cut to zone 1

@transition fade in white

@FLORA enters from left to screen center AND FLORA is run_athletic AND FLORA faces right

@FLORA is (WHATEVER THE ANIMATION IS THAT MAKES THE CHARACTER HOLD THEIR STOMACHS IN PAIN…)

    FLORA
(Must..)
(Keep...)
(Going...)

@FLORA is deepbreath

@pan to zone 3 AND FLORA walks to position ____ in 4 AND FLORA is run_athletic AND FLORA faces right

@FLORA is _____

???: Hello Flora and goodbye

sound Gunshot

@FLORA is faint

@cut to zone 1
&YOUNGPAISLEY stands screen center AND YOUNGPAISLEY faces right
&FORGOTTENGIRL stands screen left AND FORGOTTENGIRL faces right
&YOUNG PRUDENCE stands screen right AND YOUNGPRUDENCE faces right

@YOUNGPAISLEY is scream AND YOUNGPRUDENCE is sob_sniff_loop AND FORGOTTENGIRL is dismayed

@FORGOTTENGIRL exits left AND FORGOTTENGIRL is run_cry_offset

YOUNGPAISLEY: MAY, NO!!!

@YOUNGPAISLEY is scream

@YOUNGPAISLEY is weep_cry_loop

@transition fade out white

@reset hsl