You will find the MyNHTV app in the AppStore (Apple) or the Google PlayStore (Android). Make sure you select the right one, because there are also other NHTV apps available in the stores.
The name of this app is My NHTV / Stucomm BV (see picture). You can use your NHTV login (studentnumber and password).
FAQ about the app are available via this link. Should you still have problems downloading the app, please contact the Servicedesk.