Hi Jeanette, welcome aboard!
The
Youth Clubs on Disney Cruise Line are so much fun! Your girls are both the perfect age to participate in all of the wonderful activities in Disney Cruise Line's tween club, Edge, though your 14-year old could also check out the teen club, Vibe, as well.
Since they do not need to sign in and out of these older kids' clubs, there is no real pre-registration required.
If your 12-year old is interested in participating in the fun going on in the Oceaneer's Club and Oceaneer's Lab, which is for ages 3 - 12, she would need to register, and you could also give her sign in/out privileges so that you wouldn't have to check her in and out yourself.
Pre-registration for the Oceaneer's Club and Lab can be found in your cruise reservation online. Log into the Disney Cruise Line website with your reservation number and click on the "My Cruise Plans" tab on the left hand side of the page. Down in the second section there you will see "Child Registration" where this can be arranged.
I hope this helps, Jeanette! I do highly recommend that if your girls plan on participating in the Edge or Vibe that they attend on the very first night as that is when many of the plans are made and friendships are formed. It is much easier to get to know others that first night since everyone is new and just getting to know each other.
Have a wonderful cruise next month, Jeanette!