How to disassemble a Dell Vostro 15 3558 laptop?

Question

laptops

As a gift to the laptop they gave RAM and SSD. I unscrewed all the screws from the bottom, as well as under the battery and under the CD socket. But not a single hint that at least something can be removed. If anyone has experience, please share. Google did not give anything on "disassembly", since the model is new. Thank you)
PS Hands are even, I have taken apart an old Acer more than once, but here it’s just a stupor) No matter how I had to remove the keyboard and look for more screws under it
upd Removed the optical drive.

Answer 1

Dell Vostro 15–3558 Owner's Manual Googled it
in 5 seconds.