Doesn't seem to work…

Just installed this and it wasn’t working, so I dug around a bit and found a few bugs:

You used add_action instead of add_filter in class-frontend.php on line 17.

Also, line 40 should be:
$wpead_options = get_option( 'ead_options' );

(not wpead_options, or it bails out early due to no options being loaded).

PS- Settings link on the plugin list is broken:
options-general.php&page=ead should be options-general.php?page=ead

https://www.ads-software.com/plugins/enhanced-author-dropdown/