Hi voodoochill,
thanks for reaching out.
You probably choose the AdSense ad type and the Wizard is enabled, which might hide some options.
Please disable the “Wizard” on the ad edit screen by clicking on the “Stop Wizard” button at the top of the page.
You should see an option in the “Ad Parameters” that allows you to add your AdSense code. If you connect to your AdSense account under Advanced Ads > Settings > AdSense then the list of ads will also be imported and show up there.
Please let me know if you need anything else.
Best regards,
Thomas