SquareSpace

This tutorial will help you activate the clarity tracker on you site, please note that the ability to add the tracker is only available to SquareSpace users that support Complete Javascript Customization

Also note that this also documented on the official SquareSpace site:

Adding custom HTML, CSS, and JavaScript

It might be better to check the official documentation because SquareSpace is frequently updated.

Step 1

Login to SquareSpace account, Now, go to the site dashboard you want to activate the clarity tracker.

Step 2

On the left Menu scroll down and click Settings

Step 3

Scroll down and click on Advance

Step 4

Click on Code injection

Step 5

Copy the Tracking code from the clarity dashboard: Clarity Dashboard

Step 6

Paste the Clarity tracker code on the Header box

Step 7

Clarity now will be included in all your websites pages.