The tracker doesn't need to be activated. It should track your activity when you wear it. The dongle just enables it to sync with your SP account so you can see the info. If you want to make sure it's working, you can tap the tracker 5 times with your fingertip after you've done some walking (at least 10 minutes), and you should see some lights--one light means minimal progress towards your daily goal, and a full circle means you've met or passed the goal.
Hope this helps.
"All your life, you have just been waiting for this moment to arise."
(Lennon & McCartney, "Blackbird")
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