Your mailing list lives in your dashboard under Engage Listeners → Build a Mailing List. Everyone who signs up through your website's email capture form appears there.
The list has two tabs: Confirmed shows subscribers who clicked the link in their confirmation email, and Unconfirmed shows people who signed up but haven't confirmed yet. Learn more in Understanding confirmed vs. unconfirmed email addresses.
Click Export to download your subscribers as a CSV file you can import into your email tool (Kit, MailerLite, Mailchimp, and many others). For the full picture, see Collecting emails and building a mailing list with Podpage.