On Frog, click on "Add a connection" and select Checkout.com.
For the title, you are free to name it as you want. If you plan to use several Checkout.com connections, be sure to differentiate them.
Then open a new tab on your navigator and connect onto hub.checkout.com.
Find your API keys (publishable key and secret key) and copy-paste them in Frog.
Click on "Save and connect" to finalize the connection.
Whenever you need to change your connection settings, just click on "Edit" to modify.
And click on "Delete" if you want to remove a connection.