setting a guest password

[lindakorn]

Is there a way to set a password for a user that is not my usual password?
If not how do I change my password for a few days?

[JD]

There is no way to control account settings on an FTP server using Yummy FTP or any other FTP client. You need to contact the server administrator to do that for you on the FTP server machine itself. The server administrator could be your ISP, web hosting provider, or a client - basically whoever provided you with the login details in the first place.