In Russian, we have a complex case system (there are six cases: nominative, genitive, dative, accusative, instrumental, and prepositional), hence noun inflexional endings usually change. For this reason, the existing translation of this phrase does not always look correct in Russian as a name should be in the accusative case, not in the nominative / default one. If one adds the word "user" in the accusative case, there will be no need to change the case of a user's name and the sentence will always look correct.