Your name is not necessarily required. However, it makes it way easier to use the app. By filling in your name, we can always complete and fill this in for you automatically. For example, when you order something online with your OK app. This will save a lot of time, every time.
You can change or fill in your name at the settings. From the overview screen, click on the gear icon in the top right corner. Under the header 'Me' you will find, among other things, 'Name'. Click to fill in or change your name. Then click 'Save' in the upper right corner.