If you accidentally changed WordPress address (URL) or Blog address (URL), and you cannot access your blog any more there is a easy solution to fix that problem by changing the option table in the WordPress database.
Changing the option settings in database is something you should do only in emegency situations.
Access the WordPress database using phpMyAdmin.
Find the table wp_options and change the value of siteurl field 
Don’t change any other parametars in table wp_options, it’s much safer to change ptions from WordPress admin.
This will enable you to gain access to WordPress admin area using standard adress [blog adres]/wp-admin
Thats all!
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