Opel Vectra del 98 100cv Diesel

Hello, my name is Manell, I am new to this page, I don't know where I have to present myself, but this topic if you know how to solve someone would do a great favor.

Two days ago I made the change of fuel filter (diesel) to an Opel Vectra from 98 '100cv 2.0cc diesel, but it does not start because it surely has air in the circuit, I have read the manual and puts that the purge is made from the filter acting with the starter engine, but I do not know what screw it wears, I think it is under the housing where the filter is hosted, but the screw Being, does anyone have any idea?
Thank you.

The best way to bleed is from the injectors themselves, it is faster and more easy if you do not have to disarm much clear