Need help on XI Portfolio(Free version)

Hi there,

I’m using XI Portfolio theme, witch is a free theme from the WP pool. I wish to change the logo url of wordpress (W) and found this plugin! But unfortunately it doesn’t work.
I can see the tab on the Customize page, but the logo won’t change.

Can I have some support?

Thanks a lot for your time!

The page I need help with: [log in to see the link]