Trying to get this plug in to work with Relia theme

Sorry for the delay…
Did you mean “Realia” theme?

Then go to the plugin’s settings page and near the bottom of the page fill in these:

The classes: entry-header
The regular expressions: <span class=”author(.*?)/span>

Another way is this. Go to Appearance -> Editor.
Then scroll to the bottom of the file, and place the cursor in a new line at the very bottom. Then paste the following:

.entry-header .author {display:none;}