1. Login to your Customer Control Panel & click on Account from the left-side menu options: 


  1. Click on Subscriptions:


  1. Click on the relevant G-Suite subscription:


  1. Scroll the page down & click on Change Resource Limits:


  1. Use the (+) or (-) buttons to increase/decrease the # of licenses & click on Ok:


  1. Click on Confirm to place the order: