If you do not remember your current password, simply tap on "Forgot your password?" during the log in process. Enter your e-mail address as the next step and tap on "Reset password".
An e-mail will be sent to your e-mail account. In this e-mail you can request a new password using the provided link. A pop-up will appear within the app where you can enter your new password and finalize the process.
Please also make sure to generally allow push-notifications for our app in the respective settings of your device.