hey, welcome aboard fellow sydneyite!
ok first things first... you need to align your finderscope to the rest of the telescope.
secondly, people who are new to this commonly believe that you can "zoom in" with an eyepiece by twisting the knob on the focuser. this is wrong. each eyepiece has a point where it focuses, moving either side of that will put it out of focus.
my sugestion is to center mars in yous 25mm eyepiece then while its centred pop in your 9mm and focus it.
hope this helps!