Hi there! I see you're at Diamond 2 league in Paper.io 2, but the "Play with Friends" feature isn't unlocked yet. Let me help you with this.

To better assist, could you tell me if you've noticed any messages or prompts about the feature? Also, have you tried restarting the app or updating it to the latest version? Sometimes features unlock automatically after reaching a particular league or level, but occasionally they might require an app update or even signing in with a social media account.

Here’s a simple checklist to try first:

1. Update the Game: Go to Google Play Store and ensure Paper.io 2 is up to date.
2. Restart the App: Close and reopen Paper.io 2 to refresh the features.
3. Sign In: Some multiplayer features unlock when signed in with a Facebook or Google account. Have you linked your account?
4. Check Network Connection: A stable internet connection is needed to access multiplayer features. Are you on Wi-Fi or mobile data?

If you've already done these, let me know, and we'll dig deeper into your specific situation to find a solution!