Open the Settings app
You might assume that, dealing with iMessage apps, you’d have to open the Messages app. But, for some reason, that’s not the case! Instead, you’ll have to head to the Settings app – the app with a mechanical cog icon if you’re unfamiliar.
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Tap Messages
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From the main Settings app menu, scroll down until you see the Messages section. Tap it.
From within the Message settings menu, tap iMessage apps. This will take you to a list of all the iMessage apps currently installed on your iPhone or iPad.
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Tap iMessage Apps
Tap the delete icon next to the app
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From the list of installed iMessage apps presented to you, simply tap the delete icon to the left of the app you want to get rid of.
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Once you tap the icon, a Delete button should appear on the right-hand side of the app. Tap that.
Tap Delete
Confirm your decision
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Finally, to confirm that you want to uninstall the iMessage app, tap Delete on the pop-up that appears.