[twitter-dev] Twitter Posting API c# how to change API to your custom name

[visli.com]

I created a Automatic Twitter Message system using twitter API, I can
post message from my local machine to twitter website, I like to
change API to my name(eg less than 5 seconds ago from TwitPic ) I like
to change less than 5 seconds ago from Api to less than 5 seconds ago
from abcxyz.

Please help.