You can now help your clients if they have problems updating their password, just follow these steps:
1. Go to the Clients tab and look for the one you want to change the password of, then click on the edit icon next to their name.
2. Go to the Details tab and click on Password.
3. Type the new password, confirm it and click on Save.
You can now give this password to your client and they can change it later from their account.