I have two apple IDs. How to I erase one
my Mac isn't recognizing my iPod...it's older. What can I do?
Mac Pro, OS X Mavericks (10.9.2)
You appear to be asking two different questions.
1) You don't erase Apple IDs. Just stop using the one you don't want to use anymore.
2) If iTunes doesn't recognize your iPhone, iPad, or iPod - Apple Support