Within your InfusionSoft dashboard you’ll want to first retrieve your HTML Subscribe Form code. For details on how to find your embed code: How to Find Your InfusionSoft Embed Code.
You will find something similar to the following.
From there you’ll simply want to extract values as follows.
Your Form Action URL is found within the <form> tag.
From the above code your Form Action URL would be as follows.
Form Action URL: https://tt999.infusionsoft.com/app/form/process/99999fe999d99fcca9999b99999e9999
Your Email Textbox Name will be found within the textbox input tag.
From the above code your Email Textbox Name would be as follows.
Email Textbox Name: inf_field_Email
And finally your Hidden Fields will be as follows. Simply copy the hidden input tags in their entirety.