I first referred to a link explaining how to set a page as your front page. What I want is to set a category of my blogs as my front page display.
Hoping for an answer, I went to the following link: http://en.forums.wordpress.com/topic/1-category-as-front-page?replies=4
It effectively redirects me to my first link. Though I can make a page on wordpress.com and set it as my front page, I still haven't understood how to set one of my blog categories as my front display.