Keep in mind that editing a form with existing payments or recurring plans associated will not affect those already existing payments or plans.
1) Click on the Forms button in your account's main navigation.
2) Click on the form you'd like to edit.
3) Click the Edit button.
4) After you've made your changes, click on the Save & Finish button.
All changes will be immediate and there is no need to update your Form's links or embed codes.