See if there is an ASA setting in the menu.. lowering it will slow the shutter
No way then - I have a Casio of similar size - but has more options - including exposure settings
Should be a knob on top with numbers... for Exposure... maybe 60 is in a different color... lower numbers are longer exposure... is there a "B" that keeps the shutter open until you hit the button again.
Oh... close the aperture, "Ring on the lens". to get sharper images.