Created users not able to sign in

Created users not able to sign in

Hello,
I am admin for my company's account. I created few users and sent them their passwords. However, they are complaining that there is no account setup for their email address.

Can you please help? 

This is how added users:
1. Go to Control Panel -> Mail & Docs -> User Details -> Add User

Let me know if you need more details.

Thanks