Why I cannot answer a question and change my profile picture?

[Jimmy]

You can not have a picture or avatar with a hidden profile.
http://profile.yahoo.com/T6QNXRID46ZJTACYOKPKVYPTE4

Your Profile is Hidden to make your avatar visible go here http://pulse.yahoo.com/y/settings click Manage Privacy Settings.
Move the second tab so it says Your profile is currently visible.

AVATAR

Go here , http://profile.yahoo.com top center put the arrow on your avatar, click change picture.
From there you can upload a image from your computer or import a picture from facebook. When finished click submit on the next page.
Go here to make a Yahoo Avatar. http://avatars.yahoo.com/
Yahoo Tutorial - http://help.yahoo.com/kb/index?locale=en…
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If you want a custom avatar go to one of these sites and make a custom avatar, save it to your computer and upload it as a picture.
http://www.voki.com/
http://illustmaker.abi-station.com/index_en.shtml
http://help.yahoo.com/l/us/yahoo/answers…