Hi,
We would have done this already but Instagram officially doesn’t allow Instagram Sharing button like other social websites do. They want people to use their App to maintain quality.
For header social, we will add Instagram profile link icon in the next version.
To reposition social sharing: you will have to edit code directly. Checkout code starting line 71 in content.php . For eg. line 71 to 73 is facebook and similarly other services are below that.
To reposition header social icons, check out line 21 of inc/extra-functions.php