To change or set up your Primary Domain, follow these instructions:
Step 1: Open your Domain Settings by clicking + Add A Domain from your dashboard
Step 2: This will open your Domain Settings window. If you have your Primary Domain setup, you will see a House icon to the left of the domain.
Step 3: To change the Primary Domain, click on the Domain you want to set, to open up it's settings.
Step 4: On the bottom right corner of the domain's settings, click on the House icon.
Step 5: Once set, you will see the House icon move to your new Primary Domain.
Step 6: Publish your site to update your current live version!