Reset a Reseller Customer's Password

Log into WHM.

In the left-hand sidebar, expand the Account Information section.

Click Password Modification.

Select the account name or username in question from the available options in the Account Selection section.
Note: resetting the password for an account resets the password for all related services that customer uses, like FTP, MySQL and WHM.

Type a new password in the Password Entry section.

Re-enter the password in the Password (Again) field.

Click the Change button near the bottom.