To understand the features available in each Discount Ninja plan, go to the Settings of the app, and open the "Subscription" module.
Click the "Change plan" button to view all available plans.
The list of plans will be displayed, comparing features and prices.
Your current plan is listed on top.
Click the "Select [plan]" or "Start Trial" button to change to the plan of your preference.
For more information about sessions read this article.
For additional information about upgrades and downgrades, read this article.