Hi,
To do that, create your dashboard and a css file; then put the css file in $SPLUNK_HOME/etc/apps//appserver/static. Call that css file in your dashboard. After node add this example of source code:
<html>
<h1 id="id2">
Top Sourcetypes (Last 24 hours)
</h1>
</html>
Copy your image logo in the directory $SPLUNK_HOME/etc/apps//appserver/static. the image most have the extension .png, .jpeg.
Now, in your css file, add this source code:
#id2 {
background-image: url(your_image_name.png);
}
Finally save.
If there is no change, try to restart splunk.,
