Rokagram was Instagram for Roku
Rokagram stopped working on June 1, 2016 due to new rules from Instagram regarding approved uses of their API. I'm working with Roku on the best way to handle the situation.
Read all about it here: Instagram API and the Transient Nature of Public Social APIs (my exchange with the author of the article in the comment section)
For more, see this post on reddit https://www.reddit.com/r/Roku/comments/4nd3go/roku_users_staff_please_help_get_rokagram_back_on/