Tweaking requests

Very simple requests:

on the free Mercury Theme

I simply want the “username” remove from “status, posts etc” (front/main page) … reply’s username is ok …

Here is the screenshot as right now

https://tdog.us/blog/screenshot/CaptureUsername.jpg

and this screenshot is what I am aiming for

https://tdog.us/blog/screenshot/CaptureUsernameRemoved.jpg

Thank you

Where can I modify this “TDoGChad. Whatcha up to?”

Thank you again

p.s. what is permalink exactly do ?
I looked up and it said … Permalinks are the permanent URLs to your individual weblog posts, as well as categories and other lists of weblog postings. A permalink is what another weblogger will use to link to your article (or section), or how you might send a link to your story in an e-mail message. The URL to each post should be permanent, and never change — hence permalink.

Is it like a “simple and direct” shortcut? … that’s it, isn’t it ?

If I want to remove it then how can that be done ?

Thank you very much.