Hi @Lore!
It sounds like you trying to send an email to a user in Mailchimp when someone opts in, is that right?
If that’s the case then you first need to set up a Customer Journey in Mailchimp (here’s their help guide on how to do that). Customer journeys are a bit like automations built within Mailchimp so you can say things like ‘when a tag is added to a subscriber, send them x email’. To use a customer journey in Mailchimp with Zapier, choose the tag added starting point for the journey.
Then set up your Zap like this:
- Mastermind - Opt in Submission
- Mailchimp - Add/Update Subscriber
In the Add/Update subscriber, there’s a field to a add a tag to the subscriber, add the tag that starts the customer journey in that field. When the subscriber is added, the Mailchimp automation will start and send them the welcome email.
Let us know if that works for you!