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You won't be able to send it from your photos either. If you don't have a switch to enable MMS then your carrier has not provisioned MMS on your account, or you do not have cellular data enabled. MMS requires cellular data.

One way that can occur is Settings > Messages > iMessage = “Off”.

Or possibly Settlings > Messages > MMS Messaging = “Off”.

Nothing is attached.

Open the Photos app, find the image, and you can send it as a message or anything else.

traci069 wrote:

I already had iMessage off.

That’s a problem. It should be “On”.

You may take a screenshot, then send that as a message.

If that fails, there are many possible reasons. Rather than ask us to guess, we ask you to provide many,many more details about the exact steps you performed, what succeeded, what failed, what you saw, etc.

What happens when you tap Messages on the Home screen. Does it open? Can you send a message normally?

The line with Mail at the left end - slide it to the left to see more options.

Well, I'm stumped. I've never seen that before, or heard of it.

Glad that answered your question!

traci069 wrote:

in the past, on iPhones I had I wouldn’t receive some people’s texts if that was on.

That at may be caused by those folks failing to deregister iMessage after transitioning from an Apple device.

Deregister iMessage on your iPhone or online - Apple Support