How to remove challenges with option "Invited-only" enabled

I wrongly create two challenges with option “Invited-only” enabled. Now whenever I create a challenge, an error message display " You already have 2 outstanding open live or faster challenges".
How can I remove the two challenges? I can’t find any way to do that on the website.

Go to www.online-go.com and the challenges should be near the top of the page

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