It is possible to set up your Mailchimp integration so that new leads are automatically assigned to one or more specific groups. To do this, follow these steps:
1. Go to the Integrations view in the campaign builder and select your Mailchimp integration from the sidebar.
2. Scroll down to the Lead Segments section and choose the Automatic option.

3. Select the group(s) you want new leads to be assigned.
4. Click "Save."
Alternatively, you can allow your visitors to choose which group(s) they want to be added to. To set this up:
1. Go to the Integrations view in the campaign builder and select your Mailchimp integration from the sidebar.
2. Scroll down to the Lead Segments section and choose the User Input option.

3. Configure which group(s) should be available by selecting the eye icon for the desired groups.
4. Choose either Radio Buttons or Checkboxes, depending on whether you want visitors to be able to select one or multiple groups.