HELP!! Navigator installation Mercedes Sportcoupè

I've a mercedes C Class sportcoupè 220 cdi (2001 year) and i woud to install the navigator that i've just bought . No problem to connect it, I've a manual, but HOW TO REMOVE THE DASHBOARD? That is, how to
remove the metal panel that start from the central air vet to the central arm support and that covers the 4 scrow which will support the navigator?
Thanks Giovanni

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