To update your Hysteria subscription,follow these steps:

1. Log in to Hysteria: Go to the Hysteria website and log in with your credentials.
2. Navigate to Subscription: Go to the "Subscriptions" section in the dashboard.
3. Find Your Subscription: Use the search or filtering options to find your current subscription.
4. Update Subscription: Click on the "Update Subscription" button or icon next to your current subscription.
5. Select New Subscription: Choose the new subscription you want to purchase or modify.
6. Complete the Purchase: Follow the prompts to complete the subscription update.

If you encounter any issues, ensure that you're using the correct email address and that your subscription details are up to date.