How can I remove the link to the "written by" name shown on a post?

When I click on the "written by" name shown on a post - e.g., BMU Topics Editor (please see http://blackmothersunited.org/letstalk/) I'm directed to http://blackmothersunited.org/author/kimberly/.

I want to unlink the links created in this field since the direction to such pages like http://blackmothersunited.org/author/kimberly/ is not productive.

How can I accomplish this?

I look forward to hearing from you.

Sincerely,
Kimberly