moving from machd to mac os lion 10.75 how do i update my macbook air Mac OS X Lion 10.7.5  to a more up to date version as I need to install remote access. When I try currently it says
Microsoft Remote Desktop can’t be installed on “Macintosh HD” because Mac OS X version 10.9 or later is required.

please help
Go to the Mac App Store, then click on the updates tab and download &amp; install the latest update