i should have stated that.
Raspbian buster 10
i thought that the hostname was to be entered into the 'Server string' textbox.
on the pi3 system configuration page, it displays the hostname as "raspberrypi"
this is what i entered into the Fldigi Server string textbox and as i stated in the last post;
i am not able to edit this textbox as it is grayed-out but i can still see "raspberrypi" is in there.
thanks for the contact,
dan - N1UKJ