Credits: ZhyuRo - Kun
Before you proceed to the whistle usage you'll need to get a mount.
- Horse - Tame first
- Donkey - Put on a chest
- Mule - Put on a chest
- Llama - Put on a chest
- Strider - Put on a saddle
After the mount is tamed, you can assign a whistle to it. Hold Sneaking and tap on the mount with a Whistle.
Edited: 7.09.23