When logged in you may change your email address, first name, surname and photo that are registered with the system.
In the menu, click on your name, this will present a sub menu, click on Your Profile option.
changing email, first name and surname should be straight forward.
To change your photo click on the picture and select a picture. If you are on a desktop computer then you will be asked to choose a picture from your hard disk, if you are on a phone then the photo library will pop up from which to choose.
Click Update Details to save the changes.