I am new to blender and I am trying to add a clay like material to an object in blender.
I tried using a material but I want the object to have a rough imperfect dull surface like play-doh. Is it even possible to do that?
For a clay material, simply set the Specularity to 0:
If you want it to be more like "play-doh" you might want to raise the specular lighting by a bit (maybe to 0.1), but it will also be important to actually deform the model some. Play-doh shapes aren't perfectly smooth. I find that using a Voronoi texture on a Displace modifier, followed by a Cast to Sphere, works pretty well. Here's an exaggerated image and a more realistic image:
Finally, here's the modifiers and texture setup I used: