I'm not 100% sure about insurance and Kasko cover.
But it's really simple to add in 2 x RAM, there is two empty slots I assume.
There is only 1 screw that you need to take out, then you open the door that is the big one.
You will spot the two empty slots to your right, on top.
You have to forcefully but gently insert the RAM there.
If you failed, the screen will just be black when you turn it on.
🙂 Hm, I'm not so good at explaining things, hopefully someone else will come along and give you better instructions.
Sorry.