You can set a new password for an SFTP/SSH user as follows
You are in the Managed Cloud Hosting > Projects section.
You have already created a project.
You have already created an SFTP/SSH user.
Select a project.
Click next to an SFTP/SSH user.
Click Set password.
Enter your chosen password in the Password box and then repeat it.
Click Save changes.
The SFTP/SSH user's password has now been changed.