Sorry if this is a basic feature of the store. I am trying to create a email list in which I offer a free guide for email and contact information.
Essentially I want to create a pop-up that says: Enter your email, first name, and last name for a free guide. which a customer can do to receive a free pdf. How would I create such a pop-up?
The easiest method that I know of would be through MailChimp. It has the option to create a popup form. You can use this app to sync your Shopify store information with Mailchimp.
You can make this thing by using privy app, mailchimp or by coding as well.
You can go through this article for mailchimp: https://popupsmart.com/blog/how-to-add-mailchimp-popup-to-shopify
and for Privy app: https://www.privy.com/blog/2015/5/privy-shopify
Hope it helps.
You can still integrate Mailchimp with Shopify via ShopSync app.
There are also many other email marketing services that integrate well with Shopify. To name a few (in alphabetical order):