How to allocate additional storage space to users

How to allocate additional storage space to users

Hi,
Our organisation has 119.5Gb available space (purchased), but each of the 2 users (both admin) have a cap of 5Gb. How do we allocate additional space to each user or get access to the organisation space? At the moment I have used all of my 5Gb and can no longer upload files to Zoho docs.

Thanks