Groups let you categorize subscribers by interests and preferences. Your Divi Optin Module subscribers can select Mailchimp groups for themselves, or you can put them into groups without their knowledge.
Groups are an easy way to add segmentation and personalization to your email subscriber list.
They allow you to send emails to specific audiences with particular interests, ultimately leading to a much higher conversion rate.
Create the Grups in MailChimp
Log in to your Mailchimp account
From the left sidebar, choose Audience → All Contacts
Expand the Manage Audience option and choose Groups
Click on the Create Groups button
Choose the As radio buttons (people can select only one) option
Give it a title
Create the group's options
Click on the Save button.
In the above example, the group's name is Interests, and it has 3 options:
Divi Theme
Extra Theme
Divi Builder plugin
Those options will shown on the Email Opt-in module, and when selected, the subscriber will be automatically assigned to that specific group option. This will allow you to manage your subscribers better better.
Add the Groups to the Divi Email Opt-in module
Add or edit the existing Email Opt-in module
In the Content tab, expand the Fields option group
Enable the Use Custom Fields option
Click on the Plus icon
to add a new custom fieldExpand the Field dropdown and choose the name of the MailChimp Group created previously
Save your settings
This will be the final result on the Front End:
Now, a subscriber can choose a Group to subscribe to depending on his preferences.