how to make auto fill field in wordpress login form using “theme my login” plugin?

Solution: 

You could use theme-my-login template in order to add code :

• Copy wp-content/plugins/theme-my-login/templates/login-form.php in your wordpress theme folder root (the plugin will check your theme path before the plugin path).
• Add your code to get your current_user meta data ( check get_user_meta(); )
• Check if user has already this value with WP_user_Query :$user_query = new WP_User_Query( array( ‘meta_key’ => ‘country’, ‘meta_value’ => ‘France’ ) );

Hope it will help you !