The ability for participants to use a screen name rather than their real name in searches can be enabled in the event settings based on participation type. To enable this option:
  1. Select Fundraising > TeamRaiser 
  2. Click Edit next to the TeamRaiser 
  3. Click Manage participation types 
  4. Click Edit next to the participation type for which you would like to allow screen names
  5. Click Select Type Options 
  6. Under Participant Search and Display Options, mark the checkbox for "Use My Screen Name"