Moron question which button to fill an area with paint

Tried all night cant work it out. all the buttons i’d expect fail. am very new so sorry for bein useless.

does having the educational pack mean u can’t

digital pro

hi,
i dunno about digitalpro, but have you checked the gap closing for your shape to be filled? i.e. if your shape is perfectly closed or maybe has some gaps.
just an idea.
rob