Google Adsense Integration (On all paid plans)

I would like to integrate Google Adsense to show ONE add at the footer of each of my personal blog posts in a way to monetize my traffic to offset my bills. It would be great to have a way to integrate this via the dashboard, to paste the code, and to select where it appears (For example: Display below each post). Currently, when I try to connect my site to Adsense and view example ads, it displays a 500 Internal Server Error.