You can change the password of your users directly in their user profile.

1. From the Users tab, search the user.

2. Once the user selected, click on the right side on Actions than change password.

3. Insert the new password, confirm it and press Submit
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The user will receive an email to inform them that their password has been changed and to give them their new password. When they will log in the next time, they have to enter their new password.