Dell KB216 ITALIAN Slim Office Multimedia Keyboard BLACK

I have this keyboard  and 1) at the end of the  Qwerty row there are two keys which have 4 symbols on them which I don't know how to access. two on the left side of the 1st key are the Italian accents and on the right side are wavy and square brackets. The other key on the left side are * and + sign and the opposite of the square and wavy brackets.

2) On the ASDFG row the last 3 keys have various symbols 1st key left side 2 symbols bottom right side has the @ sign 2nd key has left side top degree symbol and bottom Italian symbol right side the hash symbol and finally the 3rd key has left side top has an s sign with a circle in the centre, on the bottom an Italian symbol.

As far as I am aware there are no instructions for accessing these. In fact if you had a manual which explained all the symbols for the KB 216 Italian keyboard it would be most helpful. As I find it a joy to type with.