Add trend change arrows to an existing MT4 indicator

The indicator is a "Heiken Ashi Smoothed MTF" written in mql4 which I attach as a file.
Signal Arrows (buffer required?) must be inserted when the trend changes (Heiken Ashi colour change).The arrows must be of code 5 or 6 (SYMBOL_LEFTPRICE or SYMBOL_RIGHTPRICE).

The result must be this, whitout gap down or up: The arrow (price label) should indicate the right price when the trend changes.


These parameters (example) must be entered in the inputs menu:


to be inserted in the source code:
icustom:


if "showArrows":


and "void drawArrow":


The indicator is not "redraw" and must not have this type of error: FALSE SIGNALS! (Example of an indicator MA CROSS)


...right should be:
    

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mql4 file required. Budget and deadlines are fixed.
For an experienced devoloper this is a job that takes very little time, ....a few minutes!

Payment will be made if everything works as requested without "bugs".
Please answer only if you have understood the task well in its complexity and you are sure to solve it within the requested deadlines.