Follow the below mentioned steps to install Walmart Importer app to your Shopify store.
Step 1: Login to your Shopify store admin and click on the left menu: Apps.
Step 2: Now click on the button Visit Shopify App Store as highlighted in the below screenshot.
Step 3: Type the App name Walmart Importer in the search box at Shopify app store. Click on the Walmart Importer app as shown in the below screenshot.
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Step 4: Click on the Get button.
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Step 5: It will ask for the authorization to install the app. Click on Install app to complete installation.
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NEXT STEP:
Connect your Walmart seller account by following the instructions at: Walmart Importer - How to link Walmart Seller Account