If you are using Shopifys checkout extensibility, you will need to enable the app block before Asklayer will be visible.
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Go to Online Store > Themes, and click Customize. 
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Click the dropdown at the top and select Checkout and new customer accounts. 
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From the dropdown at the top, select Thank you. 
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Add the app block. 
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Click post-purchase-survey Asklayer. 
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Ensure it is added and save. 
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If you also want to display the survey on the order status page, select Order Status at step 5 and follow steps 6-8. 
That's it! Please note that due to Shopify's checkout extensibility limitations, the survey design and color will differ from the preview. Thank you for your understanding.