I am creating an event sign up form through Nintex Forms for Office 365 / Sharepoint Online. My issue is that I want to make a sign up button that a user can click when viewing the form and it will populate the attendees field (person / group column; accepts multiple) with a user object like in the picture below.
*Edit* I don't want to this to be on load, the end user will be viewing the form and deciding if they want to join this event or not. **
Any ideas? I'm fairly new to Nintex / Office 365 / Sharepoint Online, feel free to correct me if I'm going about things the wrong way.