In order to register/add guests on-site at your event, you must have two things:
1. A registration type. You cannot add walk-ins without having at least one registration type.
2. Enable that registration type with either a "Door" or "Online & Door" availability.
See more details on creating registration types on our registration help page.
**Please note this must be done by the web platform and not the app.
Also, if taking payment on-site, you must be connected to a payment setting.