When you create an event the "Your details" button is activated by default on the ticket for ticket events and in the welcome message for RSVP events. The "Your details" button allows the attendees to see and edit what information was entered when they where registered for the event. When an attendee press the "Your details" button they can update their own information by clicking on a button that says "Edit information".
You can set a last date for attendees to change or update their registration information. If you don't set a date people can update their registrations until the event starts.
Set last date for attendees to update registration
To set a last date for attendees to update registration information, follow these steps:
Go to your event
Click on `Settings`
Click on `Setup`
Check the box `Set last date for updating registration`
Choose a date and time under Last date in the drop down calendar.
Click on `Save`. If you don't set a date people can update their registrations until the event starts. If you do not want attendees to be able to make any changes to the registration at all, choose an expired date in the drop down calendar.