help using the aspect ratio package in lyx

Hello, I use Win7 with Miktex and wish to use the aspect ratio package in LyX but I don't manage do make it work. I used the usepackage{ar} command but it didn't work. I managed to download an archive from here http://mirrors.ctan.org/systems/win32/miktex/tm/packages/aspectratio.tar.lzma and I ma

working together on lyx document

Hello, I want to try and work together with a friend on a lyx document in a way that both of us work on other parts of it together (or at least can update it at a time). Is this possible? Thanks,