Step 1

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.
Image without caption

Step 2

Click on Theme actions > Edit code in the bottom left.
Image without caption

Step 3

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. Hit "Save" and your Shopify shop will be equipped with Userlike.
Find the unique Widget code under Channels > Website Widgets > Select a Widget > Install > JavaScript Widget code
<script type="text/javascript" async src=""></script>
To avoid CSS conflicts with the chat client, we advise you not to use iframe { !important } in your CSS. Better be more specific and exclude the Userlike chat client by using iframe:not(.userlike) { !important }.
Image without caption