Before setting up a live chat, you need to create an account on Google Tag Manager, And link it to your store.
Visit tawk.to
Click on Sign up free
Add your Name, Email and Password
Choose your country
Add your URL
Add your teams' emails, if found, then click Next: Install Widget
Click on Copy to clipboard
Visit tagmanager.google.com and click on New Tag
Click on Tag Configuration
Click on Custom HTML
Paste your code
Click on Triggering
Select All Pages and click Add
Rename the Tag Name and click Save
Click on Submit, Publish then Continue
Go to your store and preview your store to find the widget