To stop taking new entries (and only allow manual entries to be made by you) navigate to Events from your dashboard and click on the yellow ticket button next to the Event to Close Entries.
Note:
To re-open entries to the public, simply click on the yellow ticket button again.
The ticket button will show as black (closed entries) or white (open entries).
After closing the entries, you're ready to create a running order for your event 🐎