How to add a Ghost subscription form to external site

Ghost blog:

We would like to use our Ghost blog for our newsletter group & signup. The current newsletter signup form on our front page is custom-made, including the member database. We’d like to transition this to Ghost, but I can’t find any documentation on how to create a signup form for an external site that isn’t using Ghost.

In other words, I’m looking for the Ghost equivalent of such an article:

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Following… I need to embed ghost subscription form to external site… some guideline how to archive this via members api or some other way?

I wrote up how to do this here: Create Ghost Blog Subscription from External Site



Total noob here (no coding experience). If I have a Code Block in a Squarespace page, what do I actually put in the Source Code area? (see below). Do I then have to create Ghost post that has the URL =