The direct log in to the mobile application is coming in a future release of the application. In the meantime, the workaround is to log in using the email from your Google/Facebook/Yahoo account and your password. If you are unsure of what these are, log in to the web version and then click on your picture in the upper right and choose My Profile. You can use any of the emails listed here to log in to the mobile app, and you can change your password here if needed.
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