How do I upgrade my pledge in Kickstarter?

Kickstarter has an article that will help you with exactly that: [https://help.kickstarter.com/hc/en-us/articles/115005126814-How-can-I-change-my-pledge-amount-or-reward-selection](https://help.kickstarter.com/hc/en-us/articles/115005126814-How-can-I-change-my-pledge-amount-or-reward-selection)