How to add Login menu to the first sidebar (secondary menu) I need to remove from the 'secondary menu' the login/logout menu from the header, and display in the first sidebar, 

It doesnt seem to be as easy as just draging and dropping in blocks,
Try turning off the secondary menu (admin/structure/menu/settings).

Then, on the blocks admin screen (admin/structure/block), place the User menu in the first sidebar.