Can't find option to increase RAM

Nowhere with the machine shut down and the padlock unlocked do I have the option to change the amount of RAM or number of core I tried General, Options and Hardware and couldn't find it.
 
Nowhere with the machine shut down and the padlock unlocked do I have the option to change the amount of RAM or number of core I tried General, Options and Hardware and couldn't find it.
It would be easy for us to check if you can share a screenshot of the configuration window.
 
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