Modern Buddy

I have a PGO engine model # C6 H03526 and its leaking oil from this can anybody tell me what goes here ?

It would be helpful if you include:

- The year, make, and model of the scooter.

- The engine size.

- Your location/country since not all scooter models are available
everywhere.

- Additional pictures that give a better idea as to the location of the problem.
For example, a picture of the entire scooter with a circle drawn around the
area shown in your close-up picture.

Those are the in/out ports for an external oil cooler. Those plugs are leaking though I'm not surprised since there's oil pressure behind one of them from the oil pump. Not sure which scooter you have but unless there's a bypass internally I don't see how your engine is able to keep running with no oil circulating inside.
BTW, your rear tire needs replacing.