Yep - I just had same issue - setup my URL for an office fundraiser not realising it was a permanent thing, and now stuck with it - and the Help is far from helpful. Just wasted 10 mins of my life trying to update the URL when clearly it is not possible! This is something I have found with PayPal Help - its not actually related to the actual site - I had the same problem regards wanting to managed the stored delivery addresses that appear in lists when using PayPal via various websites, however doesn't seem that this possible besides the Help saying it is! Anyway not holding out any hope on this, but hugely disappointing given their sizeable development budgets and the relative simplicity of the new feature!
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