Is there a way to take an existing PDF that I created in Adobe with fill-in and place a "submit" button in it and upload this document to my website ?

If you are looking for a way to embed your PDF into your form online, you can use Jotform's PDF embedder widget https://widgets.jotform.com/widget/pdf_embedder.

You can also create your own fillable PDF in Jotform. To create one, please refer to our guide here https://www.jotform.com/help/212-How-to-Create-a-PDF-Form for steps on how to.

Let us know if you have any questions or if you need further assistance.