Hello ... it may seem silly, but my iMac has my ex husbands name as admin, and I don't want to see it every time I log in to my Mac. I can't find a way to change the, i don't want to be a guest user ... I am the admin now,and i want my name to appear, is there a way to change this please? I'm using El Capitan on a desktop iMac. Thanks you.