## Frequently Asked Questions

### Using Duolingo

- **Why did my course change?**  
- **What is a streak?**  
- **What are leaderboards and leagues?**  
- **Does Duolingo use any open source libraries?**

### Account Management

- **How do I change my username or email address?**  
- **How do I find, follow, and block users on Duolingo?**  
- **How do I remove or reset a course?**  
- **I’m having trouble accessing my account.**  
- **How do I delete my account and access my data?**  
- **What to do if your data was compromised**

### Subscription & Payments

- **What is Super Duolingo and how do I subscribe?**  
- **Family Plan**  
- **How do I cancel my Super Duolingo subscription?**  
- **How do I request a refund?**  
- **How do I use a promo code?**  
- **What is Duolingo Max?**

### Still unsure about something?

- [Send Feedback](https://preview.duolingo.com/help/support-request)