1. Open the plan and, in the Prices table, click the dashed Price value of the row.
2. In the Edit price pop-up change the amount and click Next.
3. Choose which subscriptions the change applies to: New subscriptions only or New subscriptions and when active subscriptions renew.
4. Click Save — the table refreshes with a Done! message.

With the second option, every subscription currently on that exact bundle gets the new price stored, so their next renewal is charged at the new amount. The change (old price, new price, user, date) is recorded in the Price Change Logs section below the table.