1) Navigate to Account Settings.

2) Click on the Subscription tab.

3) Drag the slider under Team Size to match the number of users you'd like to add to your account.

(You can also move the toggle slider to the left if you want to downgrade your account).

4) If you haven't already added your credit card information, simply click 'Confirm Subscription Changes'.

Please note that SlimWiki does not store any of your credit card information.