Hello @JenL114 ,
For Squarespace, it'd be the same as with other websites - using sign up forms. For instructions on creating coded forms:
editing an Inline form
editing a Pop-up form
editing a Flyout form
editing a Banner form
Once you've created your coded form, you'd then install it on your Squarespace site. If you'd prefer a simpler setup, you can instead utilize a sign-up landing page, and link to that on your site.
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