Sign-in on the platform https://platform.innovation.nokia.com/login.php?return_to=/index.php with your login and password.
When you are connected, click on the following link https://platform.innovation.nokia.com/change_password.php?return_to=/index.php to change your password.
If you have forgotten your password, click on the Forgot you password? link in the bottom of the login form
The new page asks you to enter the email you used to register to the platform.
After clicking the "Reset" button, check your mail. You should receive a couple of second later an email from the platform : [Nokia Innovation Platform] Reset password request, with the following content
Click on the link to access to the change password form :
Note: that the link can be used only once and has a limited life. If the link doesn't work, restart the entire process.
When the form appears, enter your password and confirm it and click on the save button.
Your password is now updated !