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what do I need to do to get the confirmation code for the users to sign up?

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Go to Admin > Emails and enter the appropriate settings. You'll probably need to get the correct values from your host, use SMTP if you have it as other mail is likely to get marked as spam.
Which mail account should I write in the place where smtp user name is written?
This is same as setting up SMTP account to send email on mobile. This part is independent of Q2A. You can google this -- how to configure an SMTP server. Preferably try with Gmail SMTP server.