When you generate a new lead you can choose to send the subscriber's information directly to your ConvertKit account.
Step 1 - Add A New Provider
Visit the email integrations tab of your account settings and click the 'add a new provider' button:
Step 2 - Connect To ConvertKit
To connect to ConvertKit you will need your API Key and your API Secret. You can obtain these from ConvertKit here.
Enter these details in the form as shown below and click save.
Step 3a: Lead Capture - Select A Tag
If you are creating a Lead Capture Form then you can select what ConvertKit tag should be applied to each subscriber via the 'Integrations' tab:
Step 3b: Resource Library - Select A Tag
If you are creating a Resource Library then you can select what ConvertKit tag should be applied to each subscriber via the 'Optin Settings' screen: