Hey Yukino!
The weekly Blender segment I host can be found on the CG Cookie – Blender Training YouTube channel in the Weekly Blender Episodes playlist. Anything on our Blender Training channel is absolutely free for anyone to watch.
The best way to show off your creations here on CG Cookie on your profile page. You can add projects here to show off to the entirety of the CG Cookie community. For example, here is my profile page: https://cgcookie.com/u/remingtongraphics. To get to your profile page, you can click your profile picture in the upper right, and selecting “Your Profile” from the list.
Cheers!