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For installation of the Index of the Relative cheerfulness, we should click the button Indicators at a toolbar and select from the appeared menu Ocillators - relative vigor Index

After that, appears a window where we can change properties of the exposed indicator. We can select the averaging period, fix a maximum and a minimum, and also to select visual settings.

The indicator is based on idea of that in the bull market the price of closing is, as a rule, higher, than the opening price.

Reverse is fair for the bear market.

Thus, cheerfulness is defined as growth existence

also it is calculated on the following formula:

In this indicator zones of oversold and overpurchase are not provided by default
Books on Forex are advised independently to put these zones that gives to a method still big ambiguity and possibility of adjustment to history.