To display Asklayer on Shopify's thank you page you need to add the Asklayer app block.
Go to Online Store > Themes, and click Customize.
Click the dropdown at the top and select Checkout and new customer accounts.
From the dropdown at the top, select Thank you.
Add the app block.
Click post-purchase-survey Asklayer.
Ensure it is added and save.
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.