Pop-Up Forms are available under the name “Lead Flows” within HubSpot. Currently we have multiple trigger types, but we do not have a trigger for a button click. This is something we may roadmap for the future. For now Pop-Up forms can easily be created using the Lead Flows tool within HubSpot: https://knowledge.hubspot.com/articles/kcs_article/lead-flows/create-lead-flows
Status: In Beta