How to use effects in snapchat?

I have an iphone 5s and whenever I type negative… Sepia… Or b&w… Nothing happens to the photo. My friend has an android phone and they always work when he does it on snapchat. Do these effects not work on iPhones?

Mine won't do it either, I got an ipad2 and snapchats updated, whenever I type them it stays the same right? Sigh, technology is so annoying at times

Go to the Gear Icon aka known as the Settings then under Additional Services tap "Manage"

Settings are located there.

I got a iphone 4s and my snapchat won't get the faces

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