Hi there ShienaIScool,
We can provide some guidance. When a messages send with a green bubble instead of a blue one, it means it's sent as an SMS message through your wireless carrier rather than an iMessage. There are a few different reasons this could happen. Have a look at this information to learn more and find out about settings you should check in this situation:
If you see a green message bubble
If you see a green message bubble instead of a blue one, then that message was sent using MMS/SMS instead of iMessage. There are several reasons for this:
- The person that you sent the message to doesn't have an Apple device.
- iMessage is turned off on your device or on your recipient’s device. To check if iMessage is turned on for your device, go to Settings > Messages > iMessage.
- iMessage is temporarily unavailable on your device or on your recipient’s device.
- You might need to update your settings for Messages after you set up a new device.
Next, if you're seeing that SMS text messages aren't being delivered, the issue is typically related to your network connection. From the screenshot you provided, it looks like you don't have a cellular network connection. You may want to reach out to your wireless carrier for more help with that.
If you see a red exclamation point
If you try to send a message and you see 
with an alert that says Not Delivered, follow these steps:
1. Check your network connection.
2. Tap , then tap Try Again.
3. If you still can’t send the message, tap , then tap Send as Text Message. Messaging rates may apply. Contact your carrier for more information.
You'll find all this information here: If you can't send or receive messages on your iPhone or iPad - Apple Support
Take care.
