The indicator typically sits at the bottom of the chart and moves between positive and negative numbers. When the indicator is positive, this indicates that the equity may have strength to the upside, whereas if the indicator has a negative number, this could indicate that the bearish pressures are coming in with strength.
However, it is important to understand this should be used with volume profiles because this can give you a further indication of the trend strength. If the indicator has a high number on high volume, this could indicate a strong bullish trend is near. Conversely, if the number is negative and there is strong volume, this could indicate that the chart wants to head lower.
Typically when there are volume spikes or increases, you may want to look at the fundamentals of the company because there could be a reason for the move. If everything seems fine, take a look at the most recent support and resistance levels because this can trigger stop losses or take profits depending on the direction of the chart.
Before you implement this on a live trading account, test it out on a demo and see if it fits your style of trading or investing. This indicator is one of the more widely used so you should have no issue locating tools and articles on how to use this particular tool. As with any tool, they are not always one hundred percent accurate. Instead, this should be used as an alert and from there you research and decide if the entry is actionable. Search Macroaxis as there are plenty of tools and help that can point you in the right direction.