Do you mean the ability to publish 10 photos at once in one post? Do you want users of this forum to be able to scroll through your photos like Instagram users scroll through carousels with photos in a post? It seems to me that your request looks somewhat frivolous, as well as intrusive. With such suggestions, you can contact support or write an email to the developers of the forum. But I think it's not very correct. It's better to let them create an Instagram account about their forum to develop it further. I believe forums can reach a new level through social networks and advertising like https://megafamous.com. But here, I don't insist anymore and don't post about it.