Technical Question - Kymco Top Boy 100 2-stroke

[Goliath]

Hi guys, got a technical question in regards to the above scooter.. Friend of mine just got similar one, I don't know anything about this make, I know you put the 2 stroke oil at the top in next to the fuel, but the normal oil(what type?) I am not sure about.. I know my old Yamaha DT125 there was a knob and screen where you can check the oil level but how do you check it with this scooter? Thanks in advance..

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Edit: The above scooter not mine, just got off internet to show model I am talking about..