Not a stupid question. Can you elaborate please Jenny..
Which inside workings are you referring to?
The oven comes in protective wrapping to prevent damage whist in transport... That protective wrapping should be removed before using the appliance for cooking.
Can you tell me the model of the appliance Jenny?
Can you send me a picture of what you are describing as this sounds like the cavity insulation for the main oven however that is usually white.
If it is cavity insulation then it should not be removed.. but if you send me a photo then I can confirm that for you.
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That is the insulation for the oven Jenny. Don't remove that.
That insulation keeps the heat in your oven.. If you remove it, your oven will go cold fast; will cost a lot of money to run; may damage adjacent furniture from the referred heat; may burn you if you touch it.
In your image you have a black Terminal Block on the rear of the appliance...
The wiring needed to supply power to the appliance connects to that box and is rarely supplied with an appliance..
This job is best completed by an appliance engineer.