Deleting a map from umap

Dear forum members,
I am new to this forum and umap. I created a map by clicking “Erstelle eine Karte” without being logged in. I wasn’t aware that it would be released to the public. I have a secret link to it but cannot edit it anymore. I’d like to delete it but don’t know how.
Can anyone help.
Thanks

The resources listed in http://wiki.openstreetmap.org/wiki/UMap#Feedback_and_help are more likely to provide answers on the use of umap.