I am trying to change the upper left logo for a site.com vf page. I already looked at this answer How to change the Logo in Force.com sites?
What I tried below won't work. I would like to keep the header and just change the logo (if possible).
If not, I need to understand what I need to do instead.
What I did in my site.com page header so far is to replace <apex:image url="{!$Site.Prefix}/img/sites/force_logo.png" style="align: left;" alt="Salesforce" width="233" height="55" title="Salesforce"/>
with this code <apex:image id="logo" value="{!$Resource.ChooseSeminarVFPageIcon}"/>
where the latter is a .png file but it hasn't helped.
{! URLFOR($Resource.ChooseSeminarVFPageIcon) }
will add the necessary site prefix to the URL. – Keith C Apr 10 '16 at 9:58