Having problem with plugin and css img

Hi I am having a problem according to GTmitrex ,with your plugin .

I am newbie so go easy LOL .but this is the prob.

How can I fix this please

The following images served from hluhluwegamereserve.com should be combined into as few images as possible using CSS sprites.

http://hluhluwegamereserve.com/wp-content/plugins/social-media-feather/synved-social/image/social/regular/48×48/facebook.png
http://hluhluwegamereserve.com/wp-content/plugins/social-media-feather/synved-social/image/social/regular/48×48/flickr.png
http://hluhluwegamereserve.com/wp-content/plugins/social-media-feather/synved-social/image/social/regular/48×48/twitter.png
http://hluhluwegamereserve.com/wp-content/plugins/social-media-feather/synved-social/image/social/regular/96×96/facebook.png
http://hluhluwegamereserve.com/wp-content/plugins/social-media-feather/synved-social/image/social/regular/96×96/flickr.png

https://wordpress.org/plugins/social-media-feather/