The easiest way is to just let it make changes.
When you open main window, "General" tab is displayed. You'll see a checkmark in "Current Settings". This is what you have right now.
Put a checkmark into "Optimal Settings", and you'll see changes to some values in different boxes. Just don't worry about it.
Click on "Apply changes", and you are done.
Click "Exit".
I don't remember, but it may ask you to close your browsers before applying changes, and maybe restart your computer.
Just comply.