Put them from the Super Admin, and ensure you put the correct one on each field. Put the public key where it says the public key and the private key where it says private key.
Create subscription plans matching the plans on your StartupKit on Paystack. To create plans, login to your Paystack Dashboard, and under the Recurring section, go to "Plans."
Copy the Plan Code and set it on your Startup Kit plans.
Once set up correctly, it will enable Paystack for the subscription payments-