You can reset your Cosy account password by tapping on the "Forgot password?" link in the login screen of your app (or by visiting this page)
Next, you will need to open up your emails and you should receive an email from Cosy with a link to reset your password.
Press "Reset your password" and you will be brought to a screen where you can create your new password. It's important to make sure that you complete all the criteria otherwise the password won't be accepted.
Once you have picked a password you are happy with, you can return to your app.
Simply login with your newly set password and you are all set!