I get 404 when I try to login ever since I changed the permalink

You can still get to your login page: http://wayfaroutadventures.com/blog/wp-login.php You probably haven’t done any serious damage.

Login to your site over FTP or using some file manager provided by your host and add:

define('WP_SITEURL', 'http://example.com/wordpress');
define('WP_SITEURL', 'http://' . $_SERVER['HTTP_HOST'] . '/path/to/wordpress');

See:
http://codex.wordpress.org/Editing_wp-config.php#WordPress_address_.28URL.29

Of course, the addresses need to match exactly what you had before you changed things. That should get you operating again.

Reference:

http://codex.wordpress.org/Editing_wp-config.php#WordPress_address_.28URL.29