On Frog, click on "Add a connection" and select Mollie.

For the title, you are free to name it as you want. If you plan to use several Mollie connections, be sure to differentiate them.

Then open a new tab on your navigator and go to your Mollie account.

Go in the developer section, you will see the API keys there.

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Copy-paste the API Key into Frog and click on "Save and connect".

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.

Connect to MailChimp

On Frog, click on "Add a connection" and select MailChimp.

For the title, you are free to name it as you want. If you plan to use several MailChimp connections, be sure to differentiate them.