Make Stereo Choice is Greyed out

Not sure what I am doing wrong I have a left channel and a right channel that I want to combine into one track but I can not choose the Make Stereo option? HELP please!!!

What version of Audacity and OS X? See the pink panel at the top of the page.

Is it “Make Stereo Track” that you are trying to use, in the dropdown menu that you see when clicking the name of the audio track?

If so, are you clicking in the name of the upper of the two tracks?