One library and edit it in different mac

Hi, I have an iTunes Library in one of the Macs (Mac1), I can see it in the other (Mac2) with HomeSharing, but If I want to edit some tag from Mac2 it is no possible because iTunes don't show me the info option with right click.

This is an Screenshot from Mac2.

How I can edit and Organise the same Library from the Mac2 ?

Thanks.