This is off the FAQs at the bottom of any page on the right side column.
How do I edit the date of birth and bio information associated with a name?
First, you'll need at least Level 3 permissions, then from the person's overview page, click on the "edit info" link in the bio area.
Follow my blog - I Identify as a Card Collector.
“Aslan didn't tell Pole what would happen. He only told her what to do. That fellow will be the death of us once he's up, I shouldn't wonder. But that doesn't let us off following the signs.” - Puddleglum in The Silver Chair by C. S. Lewis