How do I adjust the flash exposure if it is too bright or too dark?

In Auto mode, you can fine-tune the flash exposure compensation by a simple swipe in the Profoto app. You can also fine-tune it directly in your camera if it has the “Flash Exposure Compensation” function (sometimes known as “FEC”). In Manual mode, you have full control of the flash exposure compensation by using the Profoto app or by adjusting directly on the flash.