You want to integrate your store to blog.simply follow my simple steps.

Step 1:
   Goto magneto store files edit index.php add these lines

if ( strpos($_SERVER['REQUEST_URI'], 'index.php/admin') === FALSE )
{
define('WP_USE_THEMES', false);
require_once('../wp-load.php');   // configure your WordPress location.
}

Step 2:

copy "Your-magento-folder/app/code/core/Mage/Core/functions.php"

to   "Your-magento-folder/app/code/local/Mage/Core/functions.php"

If u not have the folder structure create that folder and paste .

Step 3:

find "function __() " this line around 90 to 100  in "Your-magento-folder/app/code/local/Mage/Core/functions.php"

thats look like 

"

function __()
{
    return Mage::app()->getTranslator()->translate(func_get_args());
}
"
U change it like this 

"
if (!function_exists('__')) {
function __()
{
    return Mage::app()->getTranslator()->translate(func_get_args());
}
}
"