A private one-on-one chat feature within the GroupMe app that allows users to communicate outside of group conversations.
Greetings!
This is Tin, I can see here that you would like to update your GroupMe app on your iPhone as it seems its not working properly and can't make a comments on it anymore.
To update, please open the App Store on your iPhone and then click the Apps tab at the bottom part of your screen. Look for the GroupMe app and you will see an option to update it if your app is outdated. If the issue persists, you can also uninstall the app and reinstall it. You just have to hold and press the app and then click Uninstall, then just go to App Store again and download the GroupMe app.
Thank you,
Tin