YoVille will NEVER ask for your password, so please be wary of malicious emails and/or forum posts that request your password, including via web links.
I have not yet worked with 8.1, so I can't tell you if it's any different than Windows 7. From what I hear it isn't much different so I will show you how it has been done and hopefully that helps. here are two links that explain ways to upload a photo, hopefully they will help you out.