Yahoo doesn’t allow users access to the .htaccess file which means that you can`t use custom permlinks in WordPress.
The Only way that works is to add “/index.php/” to the beginning of your permalinks structure so set the value as /index.php/%postname%/ or what ever you want as long as you add /index.php/ before them.
http://codex.wordpress.org/Using_Permalinks#Permalinks_without_mod_rewrite
You may also try this which do same as .htaccess do.
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