Hi Pamela!
The Premium Connect key associated with your account can be used any number of sites, although we only recommend configuring the same key on installations within the same business. For example, you may use it on a Development, Staging, and Production site.
Your Connect key can be used to purchase Coins and image licenses with the BoldGrid Connect Search, and we do not recommend using your key on sites that you are delivering to a client or another business to help prevent unintended purchases associated with your account.
Since you have a Premium Connect key you can create new Free Connect keys through your BoldGrid Central dashboard, but if you want to use premium features on your client sites then we recommend purchasing additional keys for each one of them.
I hope that this helps answer your questions and please let us know if there is anything else that we can do to help!