Add this to your default stylesheet to get a Logout Button next to "Sign Out":
body > table:nth-child(2) > tbody:nth-child(1) > tr:nth-child(1) > td:nth-child(2) > b:nth-child$ padding-right:35px; background-image:url("https://cdn1.iconfinder.com/data/icons/de-munich-icon-pack/32x32/sign-$ background-position:right; background-repeat:no-repeat; }