How to activate 'Betheme options / Blog / Excerpt length' ?

Hi Muffin, 

I'm working on 'BeJournalist' theme. 
My homepage is a blog page (similar to BeJournalist) and I'd like to choose the number of words of this articles: 
in 'Betheme options / Blog / Excerpt length' when I set the number of words to 10, nothing happens. 
How can I activate it ? 

Thanks

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