Posters are categorized incorrectly

A short film I am in "The Taking Of Broward County Savings & Loans" recently had some character posters listed, however, for some reason none of them are listed under "posters". They all have different categorizations, from "Event" to "Product" to "Behind The Scenes", etc. Is there a way to re-categorize the posters? The posters that are in need of a re-categorization are all the character posters. The main poster is the red one & that's the one we want as the "official picture" for this project but at the same time we need the other posters to be categorized as "Posters". Is there a way to re-categorize the posters without changing the main picture for this project?

Here is the link to the pictures:
http://www.imdb.com/title/tt6238824/mediaindex?ref_=ttmi_ref_mi