must be made to the layout.css file not the style.css file in the Marinelli theme folder. Search on the /*Sticky Icon*/ section…its about 2/3 down the lengthy style sheet. Copy this code and your little red sticky flag should be history.
/*sticky icon*/
#primary img.sticky{
float:none;
display:none;
margin:0px 0 0 8px;
padding:0px;
}