Log in to your Shopify backend and go to **Sales channels > Online store > Themes** in the navigation on the left. Then click **Customize** on the right.
Click on **Theme actions > Edit code** in the bottom left.
Select the "theme.liquid" template from the layout folder and go to the bottom of the editor and paste the Userlike Widget code before the "</body>" tag. If you are logged in at Userlike, you will see the code of your Default Widget below. Hit "Save" and your Shopify shop will be equipped with Userlike.