First thing you need to do is create an account at nitropack.io and add your site. If you already have an account and a site, you can simply add another one from the +1 website button in the upper right hand corner.
Make sure that you have the correct site selected (if you have multiple sites added) and click on the Connect your website button in the sidebar menu.
The site ID and site secret should now be available to you. Note that the secret is masked, so you need to click the unlock button before copying it (do not copy the asterisks).
That's it! Use these credentials to connect your platform to NitroPack.