When a price point has subscriptions attached to it, the price can be changed, though only when the pricing model is flat or per unit.
To change the price of a price point, follow these steps:
- Click Product Catalog > Plans > [Plan Name] > [Price Point] > Edit Price.
 - Enter the new price of the plan under the Pricing section.
 - Click Update.
 
The new price is applied to all new subscriptions to the plan. Existing subscriptions are not affected and continue to be renewed at the old price.