IPhone 5c won't send group mms messages?

I'm trying to send a group MMS message and it keeps saying "not delivered". What can i do to fix it? I've tried turning on and off iMessage but it didn't help. Please let me know how to fix it!

Added (1). EDIT!:

my phone number is checked on the 'send

Go to settings -- messages -- send & receive
Then make sure your phone number has a check mark next to it. If not click your number then the check mark should appear. Then you're done!

Didn't work

It didn't work

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