Unable to export MP3 after installing Lame

I have Windows 7 and using Audacity 2.1.0 (recently downloaded)
I opened a 15.8 MB file in Audacity, edited it and wanted to export the Skype file so I could post on Wordpress podcast site. But when I got to “File” and try to export, the export option is “grey” and “inactive” even though I downloaded and installed <C:\Program Files (x86)\Lame For Audacity> so the plug in should be ok, I guess.
Why am I unable to export the file? Is file to big? Do I need to take other steps to activate the plug in? What am I missing?

Check that playback is stopped (not just paused). That’s the usual reason for greyed out menus.