Log in as an admin user.
Find the site where you would like to increase the Drop Box tool quota.
Select the Go to Site link represented by the icon to the left of the site ID in the search results. The site will display.
Select Drop Box from the Tool Menu in the site.
You can enable a custom quota for a specific site participant (e.g., one student in a course site needs their quota increased) or for all users (e.g., an instructor wants every student in the site to have a quota greater than 1 GB per person).