This one I can answer! ~
See the "User Control Panel" in the upper right corner on every screen? ~ click on that ~ then click on "Profile" [in the left sidebar] ~ then click on "Edit Avatar" [also in the left sidebar] ~ and upload any avatar you want to use ~ be sure to click "submit" when you're done ~
You can also change your account to reflect the correct current time wherever you are ~ click User Control Panel, then Board Preferences ~ you'll see a list of things to choose from on how the board "looks" to you and what your personal preferences are ~ just be sure to click "Submit" when you've made your choices ~
Sooz