There are a few ways to add code to the head section of a Squarespace website. One of the easiest ways is to use the Code Injection feature. Here’s how you can do it:
Log in to your Squarespace website and go to the “Home Menu”
Select “Settings” and then “Advanced”
Under the “Code Injection” section, you will see options to add code to the “Header” and “Footer” sections of your website.
Paste the code you want to add to the head section of your website in the “Header” field.
Click “Save” to apply the changes.
It’s important to note that you should test the code on a preview or staging version of your website before publishing it.

Another way to add code to the head section of your Squarespace website is by using a third-party plugin such as “Header and Footer” or “Custom Code”
Install the plugin and activate it.
Go to the plugin settings and find the option to add code to the head section.
Paste the code you want to add to the head section of your website.
Click “Save” to apply the changes.

It’s important to note that third-party plugin could cause compatibility issues with your Squarespace website and you should check the plugin’s compatibility before installing it.

In summary, you can add code to the head section of your Squarespace website by using the Code Injection feature or by using a third-party plugin. It’s important to be cautious when adding code and make sure you test the code on a preview or staging version of your website before publishing it, and check the plugin’s compatibility.