If you're looking to change to a higher plan, perform the following steps:
Pick the plan you'd like to switch too. There's plenty of helpful info over on our Pricing page.
Go to your project's Plan page.
Click the "Switch now" button on the plan of your choice.
Review the upgrade breakdown costs.
Click the "Confirm" button to trigger the upgrade. This will trigger a charge against your team's billing card.
Note: if you're downgrading to a cheaper plan, the project will still run with the resources of the higher plan until the next renewal date. If you're upgrading to a higher plan, the project will automatically sync and deploy the new plan resources immediately after the charge is taken.