From reading reviews and comments, it seems there is some confusion about what THIS plugin does. It does NOT create forms (the GravityForms plugin does that), THIS is simply an add-on 'bridge' to send the DATA from the forms you create using GravityForms into your Infusionsoft account so that you can manage those contacts in Infusionsoft.
It does that spectacularly well, and offers some nice features such as adding Tags used by Infusionsoft as it sends the data over, so that you can use those Tags to trigger automated sequences (such as follow-up emails, etc).
It's very simple to setup with your Infusionsoft API key and account subdomain (and even shows you how to find that info if you don't know it). It's very simple to create a "feed" from each of your forms into your Infusionsoft account, and to map the fields from your form into the contact fields at Infusionsoft.
Something that isn't very clear is that if you have fields in your form that are not your typical contact fields, you must FIRST create those "custom" fields in your Infusionsoft contact record setup so that you can THEN map them from your form to those fields as you create your form's "feed".
BUT all-in-all this is a truly great plugin if you just need to send your GravityForms-submitted contacts/data to your Infusionsoft account.