Jkreativ Lite: Pinterest Icon not working

Hi all

I’ve added social media links to my site using the Jkreativ Lite theme. However, the Pinterest icon comes up as a a blank square where as the others have icons for the sites.

Can someone please tell me how to fix this in basic terms (I know some things, but am by no means a techie!). I’ve checked all the files but can’t seem to find where this might be located and I don’t know where the CSS file is located?

Please let me know.

Thanks
B