Water pump
now the belt is off... you need to remove the 3 10mm headed bolts and 1 nut
next use a flat bladed driver to carefully pry the pump away from the engine block using as little force as possible to break the instant gaskets bond...
once off
remove the gasket compound left on the block with a scraper / stanley knife blade / wire wool and clean and degrease so you get bright metal
next use a solvent cleaner or alcohol to clean the new water pump flange and the engine block.....
apply a good thick bead of instant gasket round the water pump flange and seat the pump on the stud before fitting the nut and 3 bolts before evenly tightening it down to 10nm
then after you do the rest of the cambelt (to give the gasket time to cure) fill and bleed the coolant system.. see below :
https://www.fiatforum.com/grande-punto-guides/269960-1-2-1-4-8v-coolant-antifreeze-change.html