I can't log in

Since it is possible at BloodPressureDB to create multiple users with the same email address, it can happen that the user name and password do not match.
You can also test all usernames to an email address.
Please click here to access the page for a forgotten password.

In the app you will find the forgot-password-setting directly under the registration form.

Or have you set a password for the app?

The app can be secured by a password. This has nothing to do with the user password. The password must be entered into an input field, which is displayed directly at the start of the app. No user name will be asked.
This password is stored locally in the app and can not be bypassed.
You can de- and re-install the app. If you are registered, you have to log in there.