When your account was originally created, there was at least one person listed as "Admin" for your office. Any of your current admins can go in and edit a user (click the pencil next to their name) and change them to an admin. We normally don't change that information on our end.
If by chance the original admin is no longer with your office, we can login to your account and change this for you.
See the instructions in the link:
https://submittal123.groovehq.com/knowledge_base/topics/edit-user