You can't edit the event viewer plug-in once it's been plugged into your web site.

If you'd like to change the criteria of what's displayed in the event viewer, simply follow the instructions to set up the event viewer going through the 2 steps again.

In step 1, set up your event viewer so it displays exactly what you want. Then go to step 2 to copy the HTML code and replace the old event viewer HTML code on your site.