Here is a video that shows the changes that need to be made to the candidate record in onBoard: http://screencast.com/t/1ynotG8z
Next go to Core:
1. User/Access > Profile > look up the student
2. Select the second tab for Admissions Profile
3. Select Decisions
Note: The Entering Year and Entering Grade have been changed in onBoard. Now you can add the new decision and date to Accepted.
Here is a screen shot as an example: http://screencast.com/t/nHK2nT8ah