Hello! It depends on what layout you are using as not all of them support headers... flexible squares is probably the easiest layout to add a header to. You need to upload the picture you want to use to an image hosting site and then add in the link between the speech marks in brackets to this code...
This code needs to be pasted into the empty CSS box on the customise journal link but make sure to change the height in pixels to match the height of your picture.
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timeasmymeasure
no subject
Date: 2009-01-06 11:43 am (UTC).headerimage {
height: 0px;
background-image: url("") !important;
background-repeat: no-repeat !important;
background-attachment: scroll !important;
background-position: center !important;
margin-bottom: 0px;
}
This code needs to be pasted into the empty CSS box on the customise journal link but make sure to change the height in pixels to match the height of your picture.