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Hi there lolita7,

Welcome to Apple Support Communities. We suggest following these steps to help with this trouble you're having with Messages:

• Try to restart your iPhone or iPad.

• Check your network connection. To send a message as iMessage or MMS, you need a cellular data or Wi-Fi connection. To send an SMS message, you need cellular network connection. If you turn on Wi-Fi Calling, you can send SMS messages over Wi-Fi.

• Check with your carrier to see if the type of message you’re trying to send, like MMS or SMS, is supported.

• If you’re trying to send group MMS messages on an iPhone, go to Settings > Messages and turn on MMS Messaging. If you don't see an option to turn on MMS Messaging or Group Messaging on your iPhone, then your carrier might not support this feature.

• Make sure that your device has enough space to receive images and videos.

• Make sure that you entered the correct phone number or email address for the contact.

Complete tips and details can be fond in the Apple Support article:

If you can't send or receive messages on your iPhone or iPad - Apple Support

Should this issue persist, get in touch with Apple Support for further assistance:

Get Support

We hope this helps you.