Copied the following from the Members' Website for you:
LATEST NEWS
Online Check-In Service Now Available
The Online Check-In Service is now available for Disney Vacation Club Members at www.dvcmember.com.
The service allows you to simplify your arrival by pre-registering for your upcoming stay at select Walt Disney World® Resort hotels and Disney Vacation Club Resorts as many as 10 days prior to your resort check-in. Members can access Online Check-In Service by clicking on the "View Vacation Details" link from the "My Membership" module on the homepage. For reservations that are 10 or less days prior to check-in, an orange link will appear that will allow Members to complete the Online Check-In Service process.
A welcome folder containing your Key to the World Card will then await you at a designated Online Check-In Service area in the resort hotel lobby.
As a reminder, rooms typically are available for occupancy beginning at 4 p.m.
Should be on the member website under upcoming vacations. The link is available 10 days prior to your check date. If it's not there, you should contact MS, there may be a problem with your reservation.
I just did it this morning. Once you log in to your account, bring up vacation details. You should see a link right above the Enter Celebration Information link.
Today was my 10 day mark and it showed up sometime overnight (as it wasn't there when I logged in last night).
I found it later this morning, guess I was looking for some Flashing Red Arrow or something. Dont know why I didnt think about checking my vacation info... Geesh!!!!
FWIW: I was late getting my coffee this morning....