If one of your users needs a password reset: 

1. On the ‘Users’ tab, click the name of the user you want to edit the details of.

You will see these buttons: 

 

All you have to do is select that Send Reset Password Email button and the user will receive an email asking them to create a new one.

This email will also mention the fact that an Admin may have requested them to do this - so there will be minimal confusion!