Option 1: Upgrade to the team plan
If you want to upgrade 5 or more people, this is the cheapest and easiest way to do it. There are two options for different team sizes:
Up to 10 people
Up to 50 people
The person who upgrades will be the team admin and will be responsible for payment and upgrading/downgrading team members within the team limits. This plan is billed annually. Just click "Upgrade for unlimited space" in your Settings menu.
Option 2: Pay per person
This option is great for teams of less than 5 people. Just click "Upgrade for unlimited space" in your Settings menu as above, select the "Pay per person" option, then choose Several people when asked how many people you want to upgrade.
Again, the person who upgrades will be the team admin and will be responsible for adding/removing team members. This plan is available on a monthly or annual billing cycle.
Option 3: An enterprise plan
If you're part of a team with over 50 people, get in touch via email@example.com to discuss a custom enterprise plan.