How to add feature into the Pro Sites Plans

Hello,

Where and How can I add features into each plans for Pro Sites like in your examples :

https://premium.wpmudev.org/wp-content/projects/49/screenshots/2035245605_features.png

https://premium.wpmudev.org/wp-content/projects/49/screenshots/1870602018_price-table.png

Thanks
Pending your reply.

Ludovic