Kodi skip setting using

[asao]

Hi,

I have a question about my AS3202T NAS with AS-RC10 remote control.
I'm trying to set skip steps in Kodi video playback, but can't. The setting is always +30 sec or -30 sec, never changed.
I refer to Kodi Wiki,
http://kodi.wiki/view/skip_steps
Trying to set skip setting as wiki instruction, but failed.

How can I set the skip steps as -10 sec and +10 sec?

Thank you in advance.