The About Me screen shows your profile information and allows some details to be updated.
It can be found by clicking on My Space > About Me from the left hand side:
Or by clicking on your icon on the very top right hand of the screen and selecting About Me.
Double clicking on a field will show any editable fields with black text
(if a field remains greyed out this can not be updated).
Use the Change Password button at the top right of the screen to receive an email to update your password:
You can update your Picture by clicking your Avatar on the top right of the screen and select Change Avatar or from the My Space > About Me screen, click Edit to the right of your current Avatar.