Ubuntu login

When i installed ubuntu 9.10, it does not ask anything about root. So, i gave my name as a user name and passwrd. After intalling it, ubuntu does not allow to create/delete/ edit a folder and and file. It just display you are not a root. Why?

By default ubuntu doesnt

By default ubuntu doesnt enable the root account, so you will need to temporarily enable root permissions for yourself either by typing su then type nautilus or sudo nautilus (or gksu nautilus, if you dont want to go into the terminal), this way you can edit something outside of your home folder