Change notification icon?

when i get notification from snapchat, swarm, facebook,and etc, the icon on status bar is either a message icon or a non default app icon.

how to change this ?
i think its kinda annoying and troublesome to scroll down status bar everytime to check what app is it. thank you

Meizu MX4

I don’t know how to change the icons. You may already know this but pulling down the status bar need not be done by reaching the top of the screen. You can swipe down anywhere from homescreens to pull down status bar and see the notification. But yes, while running any app one has to reach the top for that.

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