I believe the default settings come with EMA of 14. However, it should be changed to 100.
Then there are just Paranolic Sar, the harsh line you see in your pic and then just dotted lines of support resistance.
Big green number on top right is just net change. This number can be switched to tick change, currency change...
Those arrows are not specifically for buy or sell signals per se, but to indicate for the high volume bar. Although one might still take them to initiate entries.
Their rules, one of them, is to measure the distance of the signal bar to the next and closest support or resistance, for potential target profit, it has to be around 80 ticks in value or more to enter a trade, or else, it is considered invalid.
Sad part though, there is no audible alert in settings. Don't know why with this such simple thing, they couldn't include it. Not that a big deal really but still, would have been nice.