[Help screens should say HOW not merely WHAT]

I am trying to use Affinity Photo more, but keep sneaking back to PhotoPlus because it is so much easier to use.  I just can't see how to do things in Affinity - it's not as intuitive.  I wanted to alter the brightness of a photo - basic enough - but couldn't see how to do it in Affinity Photo.  I went to the help screen and searched on 'brightness' and all I got was information that I could alter the brightness which even in my dim state I had sorta guessed, but not HOW to do this.  All I have on my screen is an auto-levels button, not individual buttons for levels.  The help screen had a clever-clever image showing me a photo before and after the brightness was increased (wow, that was useful, you mean that 'after' is brighter than 'before') but not where to find the control to do it.  It also told me that the contrast can be altered, but again not how.

The help screens need work by someone with a new-user perspective (people who already know how to use a function don't need help) and explain clearly HOW not just WHAT.  Many organisations (not just software) make the mistake of getting techies to write the help - techies who already know how things work and forget to mention things that are just obvious to them.  It takes skill to write good help screens and those skills are not engineering ones whether that be equipment (not just computers) or, in this case, software.  Help screens should help, not be just a list of features.