Help with multiplier code

Hi, I am having problem with https://ptpb.pw/4Twc , https://ptpb.pw/UpJX and http://i.imgur.com/wGEVxuL.png

It just could not multiply 2 and 3.  and 3 is never read in. Why ?

Besides, there is timing violation, if I am not wrong, should be due to inefficient multiplier operator *

I searched online and found wallace tree and daddas multiplier.

Any advice ?