How to activate iMessage on iPhone?

Please don't send me the link to the website because it confuses me to much.

IMessage should work automatically whenever you text another person who owns an iphone, you shouldn't have to activate it x

Ok
Here's how:
Go onto settings (the grey cogs icon)
Go down to messages (may come up as iMessage)
Go into it and then see what settings are there.

You don't need to activate iMessage, they are activated by default.

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