To embed the Mailchimp signup form to Squarespace, you can follow these steps
#1. When you finish creating the Mailchimp signup form, you will see the embed code.
#2. Edit page where you want to embed the Mailchimp signup form > Add a Code Block
#3. Paste embed code
#4. Save and preview to see the result
#5. Note
To make it as Popup, when you create a form from Mailchimp, choose Popup formĀ
And paste the code to Code Injection – Footer