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Changed user name on 500px - how do I change store name on Fotomoto to match

I just changed my user name on 500px and now since Fotomoto is using the old url which includes my old user name, that page no longer exists and Fotomoto isn't picking up my images or portfolio under the new name. How do I change the "current store" name here to reflect the change in name on 500px?
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