Drupal Login Form Access
By Michael Ross
If the user login form on your website becomes unavailable accidentally, you can still reach the login page even if there are no links to it: Modify your browser's address by replacing everything after the domain name with "/user" (e.g., "http://example.com/user").
Once logged in, go to Structure > Blocks, find the "User login" block (probably now in the "Disabled" section), and move it to a region above.
You can even make the login block appear only to you (if desired): Click its "configure" link and set the visibility as shown here, but with your IP address.
Figure 1. User login block configuration
Copyright © 2013 Michael J. Ross. All rights reserved.