Different On/Off Icons Help

[och]

I'm using this plugin (https://www.proboards.com/library/plugins/item/324) and I add my images but they are all small and blurry. How do I make them the original size?

[Kami]

Please provide a URL to your forum :) Unfortunately, there could be a variety of reasons this is happening so without being able to see it in action there's no way to diagnose.