> How can I change the reseller-password with the client?
You change the reseller password at the RWI (Reseller Web Interface) The manage.cgi client is for managing domain names, not your reseller account.
> How can I change the reseller-password with the client?
You change the reseller password at the RWI (Reseller Web Interface) The manage.cgi client is for managing domain names, not your reseller account.