1. Choose an Email Marketing Provider: Most reputable email marketing services like Mailchimp, AWeber, and Constant Contact offer double opt-in functionality. 2. Set Up the Subscription Form: Ensure your website form collects the necessary information and triggers the confirmation email. 3. Customize the Confirmation Email: Make sure the email is branded and contains a clear call-to-action. 4. Monitor and Analyze: Keep an eye on your metrics to see how the double opt-in process affects your list growth and engagement.