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“Enter user name?”, with a question mark, is a question to which the answer is either “yes” or “no,” not a username. Accordingly, I removed the question mark. (Another possibility would be to simply ask: “What’s your username?”)
Also, the Oxford Dictionary of English gives the compound word “username” to refer to "an identification used by a person with access to a computer, network, or online service,” which I suppose it’s the meaning intended here. I rewrote it like that.