95 Nissan Altima few questions.......please help

I have a few questions for my 95 Altima.

1) How do I open/remove the "parcel shelf" at the back??


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2) How do I open/remove the front "dashboard"??


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3) My engine coolant is at a very low level. Since I don't know which coolant was there previously so do I:-
(a) Flush out the old coolant and put in a new coolant??
(b) Just add any coolant to the old one??