Editing your user account
Click on your userpic/avatar in the user sidebar:
You'll be taken to your user control panel:
Click on the "account" button to access your account information area.
You'll see various options:
Edit your profile biography
Change your email address
Upload a userpic/avatar
Change your password
All of these should be relatively familiar processes. However, please ensure you are clicking the appropriate "SAVE" or "CHANGE" buttons on those pages to keep your edits!