Advanced Workflow HTML forms

Hello,

I am new to Adobe sign platform, looking for information about Advanced Workflow. This web page and video says we can initiate workflow with HTML form, but I Cant find anything in portal or anywhere. Can someone please point me in the right direction. We have enterprise account. How can we create HTML forms to initiate the process, how to build advanced workflow?

https://acrobat.adobe.com/content/dam/doc-cloud/en/pdfs/adobe-sign-advanced-workflows-sb-ue.pdf

https://acrobat.adobe.com/us/en/sign/features/document-workflows.html

https://theblog.adobe.com/enhance-the-e-signature-experience-with-advanced-workflows/

Thank You