How do I answer my Samsung S4?

Slow down, watch the screen when you answer, there's a picture of a phone with arrows that show what direction to slide your finger. When you slide to the right, the call is answered with a circle that grows larger around the answer call button, go slow when you are swiping, this isn't the magnetic strip on a credit card swipe, the call is answered when the screen changes to show the in-call timer.

Impossible, you must be pressing in the wrong are, are using to much of your thumb. Maybe you got a chinese knock off of the S4, sometimes those phones have a resistive scree that makes you press it harder.

you cant it impossible