Java Question Problems updating a published app


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I am trying to update an app which I have previously published and am meeting a number of obstacles. After updating associated information (now pending), I finally found how to upload the APK. However it was refused after apparently loading. A message said it was a "debug" file but no, it was sent just after successfully compiling it as a "release" file. The message also said that the certificate does not match that of the previous release??? I never had to deal with release certificates before and don't know how to assign one. Further, I no longer see a menu item in B4A for assigning a new version as I did before. Can someone let me know how to publish an update to a published app?