Checkout says Test order limit reached (10). How do I place more test orders?

Each store can hold up to 10 test orders at a time. To make room:

1. Go to Orders → Manage Orders and click Filters.
2. Tick Show test orders.
3. Click Purge test orders and confirm with Purge.

This permanently deletes all your test orders, and you can place up to 10 new ones. It only removes orders with the Test badge. Your real orders are never touched. Purging can't be undone, so look at anything you want to check first.