To change the site that you are subscribed to:
- Go to your Account Management page.
- Login with the same account you used to sign up for the subscription.
- Select 'Edit' next to the current site URL.
- Enter the URL of the new site.
- Press 'Update.'
Note that the steps above are for non-Agency plans only. You can find steps for the Agency plan here: How do I change the site for my Agency Project?