message not delivered , how to delete?

Hello Jrscottcbr,

Thanks for asking the Apple Support Communities for help with deleting a message. You have two options. You can delete just the failed message, or delete the entire thread.

This article has the process: Use Messages on your iPhone, iPad, or iPod touch - Apple Support

"To delete a message:

1. In a message conversation, touch and hold the message bubble that you want to delete, then tap More.
2. Tap , then tap Delete Message. If you want to delete all messages in the thread, tap Delete All in the upper-left corner. Then tap Delete Conversation.

To delete a single conversation, swipe left over the conversation that you want to delete, tap Delete, then tap Delete again to confirm. To delete more than one conversation, open Messages and tap Edit in the upper-left corner. Then tap the circle next to the conversations and tap Delete in the bottom-right corner."

If you continue to have issues sending or receiving messages, please check the troubleshooting here: If you can't send or receive messages on your iPhone, iPad, or iPod touch - Apple Support

Thanks and have a wonderful day.