I'm working on the Creating Components challenge.  I'm trying to create a Lightning Page tab for the lighning component I've already created.  The only choice under "Lightning Page" is "none".

Needless to say, I get the following error when I check the challenge:  "Challenge not yet complete... here's what's wrong:
The 'MyLightning' Lightning Component tab was not found. "

How do I get my component to appear as a choice for "Lightning Page"?  I've got "implements="force:appHostable" in the markup.  What else needs to happen?

BTW, I can't even start to create a Lightning Page tab in Chrome.  I click "new" and nothing happens.