Could someone please help clarify how to change skip step interval(s)?



I just cannot make sense of this setting. I have read numerous posts and wiki articles and it still doesn’t make sense. I really want to change the default single click to 30 seconds from 10. When I look at the player settings I get a list of all the current ones and all that I can do is change which ones have a white highlight. This seems to have no actual impact on the the skip time–it remains at 10 seconds no matter what I do. 

If someone knows how to do this, could you please mention it here? This setting is driving me a bit bonkers.

Thank you