Could you please check by creating a new author.
After doing this the Author area should start to display. Also, you might want to doublecheck that the author profile pages are showing bio information at the admin side.
It works like this:
Author area kicks in when there is more than one author. For eg. one admin and one editor with filled in bio.
If everything is setup correctly, you should have author page at
http://plexusambassador.com/author/authorname/
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If the above do not work, send in your login details via the contact page, I would be happy to look at it.