Why these edges are sharp in subdivisions? Can I make it round?

I want this to be round but because it doesn’t look good in shaded. Is there any way to make it flat? I couldn’t find a solution for this.

Please help. And thanks!

if you are sub surf modelling - you might need to post a screenshot showing both the sub surf and the underlying mesh by going into edit mode - like this:

How do I go into that mode? Please. I am very new to blender.

Just put your mesh into edit mode - the default behaviour should show both the base mesh and the subsurf mesh…

Toggle these settings in your subdivision modifier to see the effect in edit mode.