1. Login to your Bridge account.
2. Roll over "Management" at the very top and from the drop down click on "Your Account Profile."
3. On the Your Account page, look on the right for the "Bridge Subscription" section. It's on the lower right side of the page. Look for text similar to this:
Your plan: Sync up to 30 Smart Brands
Currently syncing: 12 Smart Brands / 9,721 Smart Products
Offer up to 50 registries
Current registries: 45 (active & archived)
This text tells that you have 45 registries and can add 5 more at now additional charge.