How to add the flashing light on my iphone 6s when I get a notification?

My friends have that and I usually answer texts and notifications because 1. I either have my phone on silent for school or 2. I don't have my phone on me or I'm busy. So if I had the flashing light thing it would trigger me. Can someone tell me how to get it.

Not sure

Go to your message/Imessage setting and there will be the sound options and keyboard clicks etc. Somewhere in there's the flash.

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