See this article: Where is the Registrant List located?

1. Search for any characters in any field, including registrant ID, status, group codes, all of your About You fields and all of your question responses
2. Search for a number in any of the fields that contain numeric information (balance due, payments, discounts, continuing education credits, etc)
3. Filter what records are selected by Registrant Status
4. Filter what records are selected by registration dates: Date Registered or Last Modified Date - searching for a date in either of the Characters (1) or Numbers (2) fields will return 0 results