In addition to setting a pin code, you can also secure the Dyme app by enabling Fingerprint or Face ID. First make sure that this option is enabled on your device. You cannot change this in Dyme itself. Then open the app and click on the menu icon at the top left of the screen. Then you click on settings, scroll to the section 'App settings' and choose 'Security'. After that you can enable pin security by setting a 5-digit code. Once you've done this, you can also enable Fingerprint or Face ID.