Hubspot has this tool called Lead Flows that let’s you add a form to your website as a pop-up window. It has various versions of the pop-up window. Does Infusionsoft have anything like that? Or would I just need to embed a form onto a pop-up window within my site?
Is your website a Wordpress site? We have a plug-in to create forms. Here is a link to the article overview page for the Infusionsoft Plug-in for Wordpress. https://help.infusionsoft.com/userguides/marketplace-apps/infusionsoft-wordpress-plugin
Outside of this, if you are not on Wordpress, or want full control over what you can build from scratch, you may need to go the route of embedding a form in a pop-up window, manually.