Hi! guyz plz tell me me how to make the edges of an image blunt using photoshop(CS2).

I'm not sure what you mean. Perhaps you can provide an example image.

Here is an example.This image has sharp edges and i need to make the edges blunt as you can see in my signature.

just Ctrl+click on the layer of the image and go to 'Select->Modify->Smooth' put desired value in px and press Enter , now press 'Ctrl+Shift+I' to inverse the selection and hit 'Delete' key