How to change mobile me to icloud on mac 10.6.8.

You will have to upgrade to (at least) Lion, 10.7.5, better would be to upgrade to Mavericks if your Mac can support it.

To install Mavericks, you need one of these Macs:

• iMac (Mid-2007 or later)
• MacBook (13-inch Aluminum, Late 2008), (13-inch, Early 2009 or later)
• MacBook Pro (13-inch, Mid-2009 or later),
• MacBook Pro (15-inch or 17-inch, Mid/Late 2007 or later)
• MacBook Air (Late 2008 or later)
• Mac mini (Early 2009 or later)
• Mac Pro (Early 2008 or later)
• Xserve (Early 2009)

Your Mac also needs:

• OS X Mountain Lion, Lion, or Snow Leopard v10.6.8 already installed
• 2 GB or more of memory
• 8 GB or more of available space

If you can set up iCloud on another device (iPhone, iPad), you can then access iCloud in Snow Leopard using your web browser. Typing "iCloud.com" in the address area of your browser will take you to an iCloud log-in screen. That's what I'm doing, since I'm still on Snow Leopard 95% of the time.