Color Not Working on grease pencil

Hi Blender Community,
I can’t seem to make the color black on my grease pencil . I tried making multiple material properties, but it didn’t change a thing please can you help me do this.
Thank you so much,
Ben-Tzion Page
p.s. you probably can tell that I am a beginner at 2d on blender so I may sound a bit like an idiot