In general - yes. Some jurisdictions may actually not have any laws that cover such deeds, but most countries and jurisdictions have laws that get you in trouble if you access someone's personal account and modify it without their permission - even if it's just changing their picture. It doesn't matter if it is in gmail or MS Outlook - or some other account. It may not get you in as much trouble as compromising the confidentiality of their account by reading their emails, but you have still attacked the integrity of their account.
To change your profile picture on wikianswers go to your profile and upload it from there.
You don't - only I can change my profile picture.
Go to your profile, and then hover over your picture. Then click change profile picture.
go onto my profile and you can click on the picture icon
Go to settings>Profile and change the profile pic.
Your mafia wars profile picture is your facebook or myspace's profile picture.
It is not possible to change your profile picture to a video.
click on your picture.
go to edit profile.. and then, go to 'picture'.. next, upload image.
You change your glogster profile picture by clicking a button that says "Edit Profile" near the top. When you get there, you will see your picture in a large version. Under it, there is a button that says "Change Photo" and you can select a photo from your pictures.
at your profile on your profile pic it says change hit browse and go into your pictures and click the one you want
in settings.