Also experiencing the same question as the OP. Following Praveen's instructions, when I get to the 'Edit' page titled "Edit contacts", the only choice I have is to change their name and number. Their is no photo icon to click on or anything else other than name and number.
However, I have just discovered that this is only the case if you are using the contacts stored on the Sim card. If you copy the contacts across to the phone by clicking on the original contact > menu > copy to phone. Then return back to the Contacts and click on the contact which does not have the green & yellow sim card icon (the one you have saved to the phone memory), you can then proceed with Praveen's instructions which will then work.