If you paid for TimesUpKidz you should have received a product key via email. It would have been sent to whatever email address you registered with PayPal, Amazon, or Google Checkout. Search your mailbox (including your junk and deleted folders) for the word "TimesUpKidz" and see if you can find it.
Maybe you've lost your product key or there was a glitch and you never got it. Fill in the form below to have it sent to you again. If that still doesn't work, find your product key by purchase receipt