Q: How to activate iMessage on my iphone6

Hello salahzallum,

I understand that you would like to setup iMessage on your iPhone 6 but not sure how to do that. I can help you out with that. All you would need to do is navigate to Settings > Messages and toggle on iMessage. Take a look a the article below for more details. 

Send messages with your iPhone, iPad, or iPod touch
https://support.apple.com/en-us/HT201287

Have a good day.