You can find your Player ID in the settings or profile section of the Cookie Run game.

In-Game Settings:

1. Tap the Settings icon (gear icon) in the top-right corner of the lobby screen.
2. Go to the USER tab to view your Player ID.

In the Profile Section:

1. Tap Player Info in the top-left corner of the lobby screen.
2. Your Player ID can be found next to your nickname.