I signed up for a few years with this service because I got a good discount through a course I was taking at the time. I started to use it but found it ended up confusing me on the shorter timeframe, screwing up my entries and exits. The interface is quite simple, you can show as many or as few currencies on the indicator as you want (Accustrength opens up in a separate window) and you can set parameters for the currencies like overbought and oversold to try to catch reversals. You can also change the timeframes. Another buddy of mine who signed up for it is no longer using it either.
I attached a screenshot of what you see. You can add or subtract currencies by clicking on them on the left panel. Trending moves happen when one currency moves away from another. However look at how jagged the moves are. You see what looks like a reversal, get into a trade and see it is only a pullback. It's definitely not an indicator you take signals from, you must use it in conjunction with an overall method. It should not be viewed often, perhaps only certain times of the day like at session open.
It's one of those indicators you buy thinking it will help you because it looks so good in hindsight but when you use it in real time it can definitely steer you in the wrong direction.