I am using your J51 Substance template. I would like to add an Instagram icon and link to the social media bar. I suspect that the simplest way is to change an unused social media icon and link (e.g., MySpace) to an Instagram icon and link and that this will require (a) that I modify the sm_icons.png file in the Substance/Images folder to replace the unused MySpace icon with an Instagram icon, and (b) add my Instagram. url in the MySpace field in the Template Manager. Where, however, do I find the file/line that should be changed so that "Instagram" is shown instead of MySpace when my cursor hovers over the changed icon?

Thanks!