I want to use picture in Unity 3D

I want to add a picture onto cube, the picture is transparent but when i add it it does this. I’ve marked with yellow what i dont want there. 122457-capture.png

There should be a material created when you drag image to the cube, in inspector select Rendering Mode to Transparent for this material (it should be standard shader). Also check setting for imported texture, in particular Alpha Source and check Alpha IS Trasparency