1. On the Shopify menu, click Online store and thems to view your current themes. On your currently active theme click the expand button next to Customize and click Edit code. 
  2. Select the theme.liquid file within layout
  3. Add the CrowdHandler JavaScript tag <script src="https://wait.crowdhandler.com/js/dev/lite-validator/main.js?id=PUBLIC_API_KEY"></script>, replacing PUBLIC_API_KEY with your public key from https://admin.crowdhandler.com, to the head of your Liquid theme, ideally as the first script. Warnings concerning synchronous JavaScript tags are expected and can be safely ignored.



Note. If you have added the CrowdHandler script tag using the theme app embed, ensure that the CrowdHandler app embed is deactivated.