In this example, a product has the Fulfillment Service in Shopify settings set to "Manual". 

In order to change the "Fulfilled by: X" box shown below to Manual Fulfillment when it shows the incorrect Fulfillment Service, you will need to log in to your Shopify store and update a setting in your Product Variants.

Update Settings in Your Shopify Store

1. Click on "Products" on the right-hand column.

2. Click "Active" to only show your Active products.

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3. Click on a product.

4. Scroll to the "Variants" section. There, you can "Edit" each Product Variant.
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5. Scroll down to the "Inventory" section. Choose "Shopify" from the "Inventory managed by" dropdown and click "Save" in the top right corner of the screen.​

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Once this is completed, you will be able to manually import your Items into Whiplash. 

Related Questions:

How do I change the Fulfillment Service in my Shopify settings?

How do I change my Product Variant in Shopify?