working on applications and technology

For a drupal website that serve as personal blog and does not allow user to register their own account , It is useless to place the user login block on the main web page, So I always remove the login block from the theme layout configurations.
Before I have another thought, Ooops! When I logout of the site, I find myself could not login to the website again! There 's no place that I could login into the drupal website!
Fortunately, Somebody have resolve this problem, all I have to do is to go to
http://mywebsite/?q=user/login
or more simplly,
http://mywebsite/user
and the website login page appear again! It is just an small but deadly problem if you don't what to do!