I am trying to post on Facebook when I type a letter it goes back to Home Screen

Hello Aussiegirl55,

Thank you for reaching out to Apple Support Communities, and we'll be happy to help in any way we can. We understand you're having issues with not being able to type in the Facebook app. Try the steps listed here to see if they resolve the issue: If an app on your iPhone or iPad stops responding, closes unexpectedly, or won’t open - Apple Support

"Close and reopen the app

Force the app to close. Then open the app to see if it works as expected.

Restart your device

Restart your iPhone or restart your iPad. Then open the app to see if it works as expected.

Check for updates

To see if updates are available for the app, open the App Store, tap your profile icon, then scroll down to see if updates are available. If updates aren't available for the app, update the software on your iPhone or iPad.

Delete the app, then redownload it

Delete the app. When you do this, you might lose data that was stored in the app. Then redownload the app. Then check to see if the problem with the app is fixed.

Get more help

• If the App Store itself is not responding, contact Apple Support for your iPhone or for your iPad.
• If you found the app on the App Store, contact the app developer. "

We hope this helps.

Cheers!