Want to use the MailerLite add on–got it setup without issue. But we have multiple groups to choose from. I don’t see a way to provide end-users with the option to select the group/groups they want to join. As is–it’s one form, one group.
If you have given people the option in your form to select a group (maybe with a radio button or drop down), you can create multiple Mailerlite feeds, and use the conditional logic at the bottom of the feed. In each feed you will select a different group, then with the conditional logic setting you match what the visitor selected in the form to the group you want to add them to. Only the feeds that match conditional logic will be processed.