If the event organizer has enabled this functionality, to publish your profile to the Attendees list within the app, you will take the following steps within the app:
Click the Gear (Settings) icon in the upper right of the event dashboard
Click the MyProfile option within Settings
Fill in the applicable fields within your My Profile. Select the checkbox for the "Tap here to publish your profile to the People list to engage with other users of the app."
Click Save at the bottom of the My Profile page.