Newbie can't get started!

I downloaded Audacity 2.0.3.dmg onto my Mac 10.6.8, imported a MP3 song to do fade-outs at the end, however the EFFECTS menu is grayed out.
I appreciate help with this! Where might I find a good how-to for music fade-ins and fade-outs? I’m fitting music to my photo stills slideshows that I create in iPhoto.
Thank you for this!

Press the yellow Stop button: .

The Manual is a good place to look .