Step 1. 

Once logged in to your Shopify Admin page, select "Apps" located on the left side of the page.

Step 2.

 In the list of installed apps, select Smart Upsells - Upsell by Surge Apps.

Step 3.

 Next is to select the "Settings" button located at the top right side of the page.

Step 4.

Type your preferred text inside 'Add to cart' and 'No, Thanks' text boxes then hit the "Save" button at the top right side to update settings.

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