You can allow your Participants to enter Offline gifts in their Participant Center for specific events by following these steps:
  1. Go to Fundraising > TeamRaiser
  2. Click the Edit link for the TeamRaiser you wish to change
  3. Click Select Event Options
  4. Under Related Actions, click Edit Advanced Options
  5. Select Define Fundraising Option
  6. Look for the option titled 'Offline Gift Recording by Participants' and check the box that says 'Yes, allow participants to record offline gifts that donors give them'