The user profile is accessible from the navigation menu and allows you to edit the information in your profile. 

You can use this interface to change your password, using the "Change Password"  button on the bottom left of the interface. Clicking this will send an email to the address you've entered into your profile with a link and instructions on changing your password, if need be.

After making changes to your user profile, click the green "Save"  button to save the changes made, or the yellow "Cancel"  button to discard whichever changes had been made.