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BB - MFI/RSI [Modified from LazyBear]

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Here is the modification from BB-MFI/RSI from LazyBear. I add the period for the BB as told by John Bollinger in his book.

Base on his book, he suggest to try :

9p RSI with 40p BB and Stdv 2.0
14p RSI with 50p BB and Stdv 2.1
10p MFI with 40p BB and Stdv 2.0

The idea is to compare the short period in indicator with Long period of BB.
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//
// @author LazyBear
// RSI/MFI with Bollinger Bands. Dynamic Oversold/Overbought levels, yayy!
// I add the BB period setting as told by John Bollinger's Book. 
study(title = "BB% of MFI/RSI [Modified from LazyBear]", shorttitle="BB%MFI/RSI[LB]")
source = hlc3
length = input(14, minval=1), mult = input(2.0, minval=0.001, maxval=50), bblength = input(50, minval=1, title="BB Period")
DrawRSI_f=input(true, title="Draw RSI?", type=bool)
DrawMFI_f=input(false, title="Draw MFI?", type=bool)
HighlightBreaches=input(true, title="Highlight Oversold/Overbought?", type=bool)

DrawMFI = (not DrawMFI_f) and (not DrawRSI_f) ? true : DrawMFI_f
DrawRSI = (DrawMFI_f and DrawRSI_f) ? false : DrawRSI_f
// RSI
rsi_s = DrawRSI ? rsi(source, length) : na
plot(DrawRSI ? rsi_s : na, color=maroon, linewidth=2)

// MFI
upper_s = DrawMFI ? sum(volume * (change(source) <= 0 ? 0 : source), length) : na
lower_s = DrawMFI ? sum(volume * (change(source) >= 0 ? 0 : source), length) : na
mf = DrawMFI ? rsi(upper_s, lower_s) : na
plot(DrawMFI ? mf : na, color=green, linewidth=2)


// Draw BB on indices
bb_s = DrawRSI ? rsi_s : DrawMFI ? mf : na
basis = sma(bb_s, length)
dev = mult * stdev(bb_s, bblength)
upper = basis + dev
lower = basis - dev
plot(basis, color=red)
p1 = plot(upper, color=blue)
p2 = plot(lower, color=blue)
fill(p1,p2, blue)

b_color = (bb_s > upper) ? red : (bb_s < lower) ? green : na
bgcolor(HighlightBreaches ? b_color : na)
So
How can I use it ?
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