To change the password of the user logged in, follow these steps:

1. Go to this URL of your appliance https://<FQDN or IP>/idna/sys/accounts
2. Log in with an Administrator user (default user: config; PW: config)
3. Change the password in the Change Password section:
   
4. Click update 
5. Log out by clicking the username in the upper right corner
6. Try logging back in with the new credentials