Please visit “Edit My profile” and insert your names and set “Display name publicly as” to your Full Name! Then scroll down and click Update Profile.

Enable Comments

To change the comment settings for a post or page you already published, first locate the post/page you want to edit on the Posts or Pages page on your WordPress.com site’s dashboard and click on its title.

Then, locate the Discussion module on the edit screen, […] check […] the options it offers.

http://en.support.wordpress.com/enable-disable-comments/