Pinterest Lightbox is designed to be used with galleries, but you are using a different lightbox on the homepage. This causes a little bit of complications because Pinterest Lightbox will only play nice with one of them. If it was my site, I would change the lightbox effect to whatever you would like, which will apply it to the team page only (the pin it button will not appear). Then, by applying the code below the pinterest button should appear for you with your custom implementation.
If this is what you are attempting to do, I would recommend adding this code to your functions.php file in your WordPress theme:
This should work, but you will notice that the PinIt button slightly goes outside of the Lightbox. This is because the particular lightbox you are using automatically adds a width/height to the lightbox which leaves no room for the pin-it button.
Due to the high interest in this plugin, I think I am going to make some updates in the future for it to work more effectively with other lightboxes, but the original vision was for it to only work with NextGen galleries.
Please let me know if this works for you.