In-product surveys lets you collect feedback directly from your users. You might be interested in collecting their contact information to follow-up with future studies or conduct longitudinal study. For example, you can collect your app's visitors' contact information to follow-up with them.
1. Using an existing template
1.1. Create a new in-product survey from the home page.
1.2. From the list of templates, you can refer to the following template.
1.3. The template will have basic tasks setup to help you get started. To make sure you speak to the right user profile for your learning objectives, ask questions that help you better filter for the right user profile.
2. Using an external link
Another option is to add the direct link to any of your published study using the External link.