Having contacts in the People page is important because it's where we pull from to auto-fill personalized information in the dynamic fields in your templates. Make sure you have at least a name and an email address for each contact in your CSV and that you map to those fields.
1. Select your group (or create a new one) in the People tab.
2. Click Group Actions and select Import CSV.
3. Click Browse.
4. Locate the file on your computer and select it.
Groups are limited to 1000 contacts.