To install the Walmart extension :-
Login to your Magento Admin Panel.
Select System >> Magento Connect >> Magento Connect Manager.
Magento Connect Manager login Panel Appears. Login with your Admin Credentials.
Unselect the "Put store on the maintenance mode while installing/upgrading/backup creation" option.
In "Direct package file upload" section browse the Walmart Extension package and click on upload.
The Walmart Extension gets uploaded on your Magento.
Once the merchant installs this extension, Configuration settings will be created in his Magento admin panel’s System Configuration named as Walmart configuration’ under CedCommerce Extension tab.
As well as a menu will be added in the menu section named as Walmart that will consist of all the panel listing.
This extension will also create a tab in the product’s general tab named as Walmart.com which will list all the created Walmart.com attribute.