Problem with address url Path

Hello,

I have a problem with url path, it can not detect my domain.

my domain: http://www.little-pinkii.co.cc
my installed wordpress directory: root/blog

the problem is when I submitting the form (updating anything using control panel) it redirects to “http://blog/…” not “http://www.little-pinkii.co.cc/blog/…” so I just put my domain in front of the “/blog…”, it works, the update that I have made has been updated, but I have to do this every time I make any change.
This way doesn’t work when I try uploading the media, so I want this problem fixed, please help me.
Thank you.

I don’t know that this problem has been posted and/or fixed or not
but I did search for it, and found nothing related to my problem.
If there is any post similar to my problem, please give me a link.
Thank You very much.