You can rename your farm by following these steps:

1. Find the central garden in your farm and click on it;

2. Enter the new farm name in the pop-up box;

3. Click the confirm button to save the new name.

Alternatively, you can:

1. Click the settings icon (gear-shaped) in the upper right corner;

2. Choose the pencil icon. In the pop-up box, enter the new name for your farm.

If you encounter any issues saving the new name, check whether it contains special characters, as some may not be allowed in the game.